Talk:Hydrogen/Archive 1

Decomposing Natural Gas
I think getting hydrogen from "decomposing" natural gas is actually called "reforming hydrogen from natural gas", (using steam) but I'm not positive if this is just the name for one way of getting it. --Ben 09:01, 8 Dec 2004 (UTC) Steam reforming of natural gas

Hydrogen production
I suggest it should be a section dedicated to hydrogen production. This would avoid telling about it in the first section and allow a more complete listing of all production alternatives, e.g., add photoelectrochemy, artificial photosynthesis, and water splitting using the heat of a nuclear power plant through a chemical cycle.

It should also be more about hydrogen storage: briefly comment pressurized, liquid, and hydrides, with their advantages and draw-backs. --Philipum 09:57, 26 May 2005 (UTC)

I was wanderign why there is nt more detail on the physics side of the hydrogen atoms. Things like thermoluminescence.

Applications
"Hydrogen fuel cells are being looked into as a way to provide power with lower emissions than hydrogen burning internal combustion engines." That can't be right, and the article on Hydrogen car is clear that the only emission is water vapor. Maybe we meant "fossil fuel-burning internal combustion engines".

Well technically, hydrogen internal combustion engines would likely produce NOx emissions for the same reasons gasoline engines do. But feel free to change the article; it could probably be clearer.

Two questions here,

a. What happens if you breathe hydrogen gas? Apart from becoming dangerously flammable I mean. Let's say you still had plenty of oxygen mixed in...

b. If hydrolysis uses an electric charge to release hydrogen and oxygen gas, and oxygen-and-hydrogen isn't just flammable but -explosive-, then wouldn't it explode every time you did that? Electric current has a way of igniting things.

Answers:

a. My understanding is nothing in particular. I believe oxygen / helium / hydrogen mixes are used for ultra-high-pressure diving breathing mixtures. Your voice would sound funny, though, like helium only more so :)

b. Electrolysis doesn't mean there's a spark, or that there's ever mixed hydrogen and oxygen present. The hydrogen comes off one electrode, the oxygen off the other (or opposite sides of the fuel cell or whatever). Evand 03:49, 22 Jun 2005 (UTC)

As for question A - I believe if you have ogxygen and hydrogen together in the same environment, they will combine to form water until one of them is used up. In order to actually breathe hydrogen there would have to be no oxygen present, and you would suffocate. (dunno how to do the "strikethrough effect" but I found this in the main article - "When mixed with oxygen across a wide range of proportions, hydrogen explodes upon ignition." So basically I was right, you couldn't ever breathe a mixture of hydrogen and oxygen.

decribe hydrogen
The article describes nonmetallic, so then what is this: http://en.wikipedia.org/wiki/Liquid_metallic_hydrogen and why is it grouped with the metals.

CGH2
Compressed gaseous hydrogen redirects here; yet there is a link to that article (thus redirecting to this page) under See also. This article doesn't seem to discuss compressed gaseous hydrogen at all. Shouldn't either the CGH2 article be written/restored, or that form of hydrogen be discussed here? Phaunt 11:19, 18 August 2005 (UTC)

Software
There is a drum machine called Hydrogen. Official website.

Stand alone atoms of hydrogen
The existence of stand alone atoms of hydrogen is disputed. The current text of the article implies its existence: Under the extremely low pressure in space — virtually a vacuum — the element tends to exist as individual atoms, simply because there is no way for them to combine. According to the article "Hydrogen - element #1" by David L. Bergman (http://www.commonsensescience.org/pdf/hydrogen.pdf) I quote "Stand-alone atoms of hydrogen are unstable and do not exist". So H is always H2 Brz7 18:51, 21 September 2005 (UTC)


 * The linked article looks like pseudoscience. The recombination energy is positive but in high temperatures the equilibrium in this reaction is shifted toward atomic hydrogen since atomic hydrogen has higher entropy than the molecular one. Also low pressure shifts the equilibrium toward atomic hydrogen since the recombination results in drop of pressure. The spectrum of atomic hydrogen is different from molecular hydrogen and both can be observed. Interstellar space is full of atomic hydrogen (21 cm line). Poszwa 01:24, 22 September 2005 (UTC)

Any drawbacks?
Are there any drawbacks to using hydrogen in any way? I would be interested to know.


 * It makes your voice sound funny? (what do you mean?) --njh 09:20, 25 March 2006 (UTC)

revert of 2005/10/24
User:Cyclotronwiki, your capitalization was ...unusual in English, to put it mildly (and then the kWh in the infobox was just not correctly capitalized). http://home.att.net/~cat6a/fuels-VII.htm is not a good reference. The numbers don't add up, it doesn't cite their sources, and it contains other errors. Kilojoule and kilowatthour per mass unit are easily converted, why have both but not MJ/m³ or kJ/mol (the H2 qualifier is only needed with mole-based units). A separate Template:Elementbox_heatingvalue is not necessary, we can include that through conventional code, unless we're planning to include something like the heats of combustion to other elements. And even then it would be more meaningful to list separate enthalpies of formation for oxygen and those elements. The effort is appreciated but I think we can do better.

As to the incorrect STP note in the properties template (a section which is used with all the elements and also contains properties at the melting point for example and other thermodynamic values not at STP), specific conditions are best included as parentheses directly with the value they refer to. Femto 12:40, 24 October 2005 (UTC)

Why connect hydrogen with Hindenburg disaster really?
I corrected the quote below yesterday to say hydrogen was inccorrectly connected with Hindenburg disaster. However, someone has reverted it and I am not fucking getting in a flame war. Do me a favour though, dig around with google and see what is out there. It shouldn't be hard since its well documented. Linking hydrogen with that accident is like saying TWA Flight 800 was brought down by kerosine. Should we then edit that article to reflect that? We cant have it both way.


 * It's NOT like saying Flight 800 was brought down by kerosene. If there was a nonflammable or far less version of kerosene (like diesel) that 800 could have been using, and didn't, and the kerosine it DID use blew it up, then that would be appropriate. Something that actually WAS the case with Hinderburg. It would have flown perfectly well on helium, which has 93% the lifting power of hydrogen. But the only source of helium in 1937 was US gas wells, and at the time, we refused to sell the Nazis any, so they had to make do with hydrogen, or not fly. They chose to fly. And got burned for it. Steve 06:09, 25 June 2006 (UTC)


 * Since hydrogen is 14.5 times lighter than air, it was once widely used as a lifting agent in balloons and airships. However, this use was curtailed when the Hindenburg disaster convinced the public that the gas was too dangerous for this purpose. Or what is the reasoning behing mentioning Hindenburg? William


 * It hardly made it any clearer to replace "convinced" with "dubed". ("Duped"? as in 'knowingly mislead' seems rather unfitting.) Clarifying this potentially misleading sentence about public opinion is a matter of the form, not of the facts. Femto 20:38, 24 October 2005 (UTC)


 * Opps, sorry about that. You are right I intended to use duped and I agree its too strong a word. Should have used something like "incorrectly linked", so yeah my edits weren't as helpful as I intended. However, I kind of still think mentioning the accident together with hydrogen is a bad idea, unless you put an effort to mention hydrogen wasn't the primary cause. To see why, observe what happen to Americans when Bush mention Iraq and 9/11 in the same sentence. I wouldn't push it further though since it seem like it is acceptable to most wikipedians. William


 * (They wonder about the omission of WMDs in such sentence?) Oh, I for one think that even an only potentially unclear phrasing is worth improving. Just no idea how right now. Femto 14:07, 25 October 2005 (UTC)


 * At the moment the article seems to say "the H2 caught fire, but it wasn't actually the H2, but it was and that's why only 1/3 people died". Gotta make up your mind! Aaadddaaammm 07:19, 29 October 2006 (UTC)

what is hydrogen fusion and what does it do
(146.129.250.100)
 * You could start reading at hydrogen fusion (redirects to nuclear fusion), depending on what you want to know. Femto 16:57, 10 November 2005 (UTC)

Most abundant element
I have just reverted 68.23.144.46's edit, in which they removed the statement that Hydrogen is the must abundant element in the universe. Now if the article stated "Hydrogen is the most abundant form of matter in the universe", then your argument (Not enough about the universe is known to assume it's the most abundant. Changed to world) would be more applicable. --Dan East 21:20, 16 November 2005 (UTC)

Known universe, then
I also recall it's not the most abundant in the world, so my edit was wrong in the first place - I apologize for the error. However, once again I state, as "the universe" is, simply put, everything, we will never know enough about it to make such distinctions as "most" and "least." Therefore, while "world" is not, "known universe" is more applicable.


 * Then perhaps a qualifier is in order. --Dan East 05:02, 17 November 2005 (UTC)

I Have a Question about Hydrogen Atom
I have a question about hydrogen atom in Modern Physics. Why may we estimate its radius by $$E=\frac{^2}{2m}+U(r) $$ then we go next step of something like...etc..(sorry but I forget the details).

Can it be calculated by classical mechanics? Or it can't be? And by Wilson-Sommerfeld's quantumlization theory,radius of H can be elpise shape,but how do we calculate it in this case? --HydrogenSu 17:52, 5 February 2006 (UTC)


 * It can be calculated with semi-classical mechanics, in the Bohr model, and gives essentially the same number. Which is a shock. But since Bohr's theory makes other wrong predictions, people are embarrassed about using it to make this good one. Steve 06:11, 25 June 2006 (UTC)

Revisions indicated
I think that we should refine this article further. It leaves the wrong impression that H2 is an energy source (it is an energy transfer agent, there is no H2 to be mined, as the article eventually explains). "Despite its ubiquity in the universe, hydrogen is surprisingly difficult to produce in large quantities on the Earth." Poppycock. It is very easy to make H2. "another promising method involves the conversion of biomass derivatives such as glucose or sorbitol at low temperatures using a catalyst." Such processes are merely an expensive type of steam reforming it seems, one strips H2 from a hydrocarbon concomitant with formation of CO2. "The electron is bound to the proton by the Coulomb force, the electrical force that one stationary, electrically charged nanoparticle exerts on another." Nanoparticle!? " It has a high capacity for adsorption, in which it is attached to and held to the surface of some substances." What is "capacity for adsorption"? Are we talking, e.g. about Pd adsorbing H2? "It reacts violently with chlorine and fluorine, forming hydrohalic acids that can damage the lungs and other tissues." do we need to link to "lungs" and "tissue"? Suffice it to say that H2 reacts with halogens to give HX. We need a section dedicated to production, it seems. And a separate section sources (where we can comment on the nonexistence of H2 wells), and a section on uses. I was under the impression that Haber-Bosch does not use H2 per se, but relies on in situ steam reforming, i.e. N2 + CH4 + H2O to NH3 + CO2 (not balanced). Any help? Smokefoot 04:09, 29 January 2006 (UTC)

Storage
Perhaps there should be a section to discuss the various methods of storing hydrogen with their associated challenges. i.e. hydrides, compressed gas, etc. Porcupine911 05:26, 2 February 2006 (UTC)

Changes
Added paragraph under "Electron energy levels" describing the 1420 MHz fine structure transition which is used by astronomers to map the distribution of atomic hydrogen gas in the Galaxy. User:SETIGuy 13 Februay 2006

Not an application?
The use as a coolant and the triple-point-cell temperature calibration are concrete applications. Why the " " comments? Femto 12:31, 13 March 2006 (UTC)
 * I guess the answer depends on one's definition of an "application" or as the article says "The element has several other important uses" (emphasis added), then lists triple point calibrants and use as a lifting gas etc. IMHO, a triple point calibrant is not the basis for many peoples' livelihood.  Important, or just a factoid?  One could list as an "application" the use of H2 in chemistry "magic shows" to illustrate combustion.  It is used as a fuel is certain gas chromatograph detectors.    My skepticism, and this comes from someone who like this little molecule, is whether we want readers thinking triple point calibrants and the like are "important."  In any case, thank you very much for your comment and feel free to remove my comments - I was trying to stimulate this very discussion and have no attachment to this article, which does contain much useful information. Cheers,--Smokefoot 17:11, 13 March 2006 (UTC)

Question; why doesn't the liquid hydrogen in the shuttle's booster lift the booster?
If the liquid hydrogen in the booster was used to fill a blimp, how much weight could the blimp lift? Could it lift the booster? —Preceding unsigned comment added by Progman3K (talk • contribs)


 * Hydrogen can lift things by making them less dense than air. Liquid hydrogen is not less dense than air. Hydrogen gas and liquid hydrogen are lighter than most other elements and compounds when they are at the same temperature and pressure, but there is a large pressure difference between liquid hydrogen and the air outside. If the air outside were liquified too, it would float.


 * Note that the blimp would float better than filled with hydrogen if the pressure inside were reduced to a hard vacuum, but the structure would collapse. Hydrogen floats because, with the same pressure, it has less mass (see Ideal gas law). The same for hot-air balloons. Hot air takes up more space for the same mass, so hot air 'floats'. --Splarka (rant) 07:14, 29 May 2006 (UTC)


 * But to answer the original question: The shuttle's tank holds 2 million L of liquid H2, which has a mass of 0.14 million Kg. Since a kg of H2 lifts 15 times its own weight (about) when converted to gas in air, then that's a lifting power in slight excess of 2 million kg for a blimp with that much H2. And the fully loaded shuttle (including fuel and boosters), as it happens, is just about 2 million kg. So there's just enough lift in that much H2, to take up the whole loaded thing. If you take it up with an unloaded H2 tank, presuming it went into the blimp, it's only 1.86 million kg, which should give enough weight for the blimp. So that would work, I thin. With a blimp AND a fully loaded liquid hydrogen tank, it would be a very near thing. And even if you made it, it would look REALLY silly. Steve 06:28, 25 June 2006 (UTC)

Image in Appearance
The current used for Hydrogen is a lot like the one used for, and doesn't really show that it is a colourless gas. Perhaps the image from the German version (slightly edited) would be a better one to use in the article? -- Scot t  10:43, 3 June 2006 (UTC)

On board H2 reformation?? Say WHAT?
I took out the wacky idea of on-board H2 reformation from biofuels. If you already have the biofuels, you just burn them in your car! Trying to get the H2 out of them first just wastes energy and emits the same CO2. Unless you've got an on-board Stargate to dump the CO2 into? Biofuels are greenhouse neutral, like wood, anyway-- the problem is we don't have the land to make enough of them. Not enough sunlight and plants in North America to power North America, unless we want to give up food :( A better way to use hydrogen is to make it with nuclear or some kind of renewable energy, then synthesize your favorite alcohol using air or fossil CO2, for transportation. This is also greenhouse neutral. However, an article on H2 is not the place to push any particular H2 use ideas. The hydrogen economy is already referenced.Sbharris 21:13, 6 June 2006 (UTC)

And why have we removed the Hindenburg from the section on H2 combustion?
A better illustration photo hardly exists.Steve 22:11, 3 July 2006 (UTC)

Hydrogen molecule
Hydrogen molecule redirects here: could we have some data on the bond length and dissociatiation energy of molecular hydrogen? Physchim62 (talk) 14:45, 19 July 2006 (UTC)

Fifty different forms of hydrogen
Including allegedy, H2+. can someone explain to me how a ground state atom with one electron can lose two electrons to become a dication? sounds like bs to me. Xcomradex 02:20, 20 July 2006 (UTC)
 * Obviously that should be H2+. I've fixed it. S  B Harris 04:26, 20 July 2006 (UTC)

Hydrogen bonding and clarifications
There's a link to Hydrogen bond in the see also section, but no mention at all of the phenomenon in the text. Am I being bio-centric in thinking it should at least get a passing reference?

Also, I've read this sentence a few times now: "Hydrogen is not a pre-existing source of energy like fossil fuels, but a carrier, much like a battery." but I can't figure out what it's trying to say. Maybe I'm just dense but it doesn't seem to mean anything at all. Any clarifications? Opabinia regalis 00:11, 7 August 2006 (UTC)
 * Okay here is the translation:

1) "Hydrogen is not a pre-existing source of energy" = there is no hydrogen to be mined or used out there. 2) "like fossil fuels, but a carrier, much like a battery" any H2 produced and burnt elsewhere is simply a way of conveying energy from place (of its manufacture) to place. This description is popular with DoE as a means of reminding wll-intentioned but naive enthusiasts that the H2 economy is not about finding H2.--Smokefoot 00:26, 7 August 2006 (UTC)
 * Aha. Wouldn't it be clearer then to say that H2 can't be mined and has to be synthesized before being used as a fuel? Unless that really is a recognized DoE phrase, in which case some reference to them would be useful. Evidently at least one US resident is oblivious, so I'm guessing non-US people wouldn't be familiar with DoE public information usage. Opabinia regalis 00:33, 7 August 2006 (UTC)
 * Hey, you're the one that killed the "non-sequitur". I agree totally with your sentiments implied above and in recent edits - but what can we do - put a giant disclaimer about the fact that there might be hydrogen in water but its not the kind you are looking for and that there are no H2 wells out in those square states? I should look for the DoE document--Smokefoot 00:40, 7 August 2006 (UTC)
 * Is there really that much confusion on the subject? Anyone who's read and understood the "different meanings of hydrogen" section shouldn't be confused. (Hrm, maybe I shouldn't ask that question if I'm pretty sure I already know the answer.) Opabinia regalis 01:04, 7 August 2006 (UTC)

A proposal to tighten this article
This article is potentially influential, so we should take steps to fix it up. Presently though, the article seems too long. Also, it appears contains a number of topics that readers outside of atomic physics would not find pertinent: So please join in and lets discuss this thing.--Smokefoot 03:32, 7 August 2006 (UTC)
 * 2 screenfuls on "Isotopes" when an article Isotopes of hydrogen exists already
 * 1 screenful on Electron energy levels" when hydrogen atom already is a full article
 * 1 screenful ea on "Hydrogen as an energy source" near the bottom and near the top the thing I wrote on "Hydrogen as an energy carrier". While there is a full article hydrogen economy.
 * also I recommend removing the stupid (IMHO) ampoule of (supposedly) H2. Readers understand the meaning of "colorless gas"!
 * IMO the isotopes section should stop at tritium and leave the rest to the isotopes article, especially since everything beyond tritium is a lab case anyway. I don't have a problem with the length of the energy levels section per se, but it's very wordy for the amount of information it contains. The chemical and physical properties section, on the other hand, is just sad - one sentence about general properties and then a subsection on combustion. Surely there's more to say? And yes, "here's a picture of that stuff you can't see" strikes me as pretty pointless, though a lot of the element articles have them.


 * I think the whole article suffers from constantly harping on the fuel source thing. I didn't dig through the history to see if this just accreted over time or what, but it's unorganized and needs to be concentrated into one section. The biological treatment is too skimpy (or, as in hydrogen bonding, nonexistent). There's also a large number of unsourced statements in the article that are in need of referencing. The energy levels, synthesis, and compounds sections are pretty much referenceless. Opabinia regalis 04:31, 7 August 2006 (UTC)


 * Agree with cutting isotopes to the short remark on the first three and offloading the rest to the main article on H isotopes (make sure all the info is there). Also, there's a very good reason why hydrogen in biology is skimpy-- its full role is too large to really be writable. Hydrogen, like carbon and oxygen, IS biology (no biochemistry takes place without it, so you may as well just reference this to the articles and subarticles on biochemistry). The best you can do here (and also for carbon and oxygen) is look the role of elemental hydrogen in biology and write articles about elements that occur in smaller amounts. Nitrogen is about has close as I think is possible to look at as a separate element in biology, and there are articles on nitrogen cycle and so on. But there's a bigger full article on biology and magnesium, so nitrogen is surely getting short shrift. BTW, we had a similar problem in the page on atoms: a section on "use of atoms in industry" was ridiculous. We finally settled on the role of use of SINGLE atoms in industry. S  B Harris 17:19, 7 August 2006 (UTC)

Cut down some heavy redundancy in the isotope section as a start. Femto 14:45, 7 August 2006 (UTC)

Re-organization?
To my eyes the ordering of the sections doesn't have a natural flow. Might I suggest something like the following?


 * 1) Different meanings of "hydrogen"
 * 2) History
 * 3) Natural occurrence
 * 4) Isotopes
 * 5) Electron energy levels
 * 6) Elemental molecular forms
 * 7) Chemical and physical properties
 * 8) Forms
 * 9) Combustion
 * 10) Compounds
 * 11) Covalent and organic compounds
 * 12) Hydrides
 * 13) "Protons" and acids
 * 14) Production
 * 15) Laboratory routes to H2
 * 16) Industrial routes to H2
 * 17) Biological routes to H2
 * 18) Applications
 * 19) Hydrogen as an energy carrier

The "Forms" section under "Isotopes" looks like it would be more appropriate under "Chemical and physical properties". Thanks. &mdash; RJH (talk) 17:37, 7 August 2006 (UTC)


 * Looks fine to me, though all the compounds you list (like acids) imply applications of the COMPOUNDS. Perhaps this is another unwritably long task like hydrogen in biology, and best left alone. In applications (OF THE FREE ELEMENT) which is about all we can space for, the main ones for H2 are (in terms of million tons H2 used) are in onsite ammonia production and hydrcarbon cracking for light hydrocarbon fuel production. These should go ahead of hydrogen as energy carrier, which is hypothetical (mostly) and in any case is well described in main article hydrogen economy. S  B Harris 17:59, 7 August 2006 (UTC)

Referencing
In addition to the rewriting and reorganization, the article needs more inline citations - and of the ones that exist, two are linked to the same basic fact (amount of hydrogen in the universe) and only one is a "traditional" academic source. I added some refs to a gen-chem text that covers this stuff in the industrial processes section, but the isotope and ortho/para ratios especially need citations, and there are whole sections that are bare. Opabinia regalis 04:08, 10 August 2006 (UTC)


 * For summarized facts from sub-articles (isotopes of hydrogen), or for other linked topics (orthohydrogen), it should suffice when the references are inherited from there. Strictly, not this article needs a cite for the equilibrium ratio but orthohydrogen. Femto 12:51, 10 August 2006 (UTC)


 * The problem with that is that Wikipedia articles are not considered reliable sources. IMHO, we still need to cite sources for whatever is included in the article. --  Donald Albury ( Talk )  22:58, 10 August 2006 (UTC)


 * I'd say put the relevant references in both places, for clarity if nothing else. If the citation is in the smaller article the fact is still referenced; it's not a matter of using another Wikipedia article as a source. It would be a pain if this were a widespread practice, though, because tracking down which of a group of related articles contained the reference for a particular fact would be a pain. Opabinia regalis 00:01, 11 August 2006 (UTC)


 * Out-sourcing references is fine and preferred according to Summary style. Wikipedia articles themselves may not be reliable sources, but the references which back their facts are. Not every basic fact needs a cite when it's available elsewhere. I don't see an organizational problem (on the contrary) in referring to more specific topics for more specific cites. Femto 15:53, 11 August 2006 (UTC)
 * IMO specific factual statements made in this article should still be cited here - obviously more specific references to subjects only discussed here in very general terms aren't needed. Matters like the orthohydrogen ratio should definitely have a citation here because, although orthohydrogen is mentioned, it isn't a child article summarized here - so summary style guidelines don't really apply. Opabinia regalis 00:13, 12 August 2006 (UTC)

I need help!!!
I Need these following Facts: Number p+, Number e-, Numer of n0, Period Number (row), Family/Group Number (column), State at ROOM Temperature (solid, liquid or gas), Is it a metal, non-metal, metalloid, or noble gas.

I need those facts for the following elements: Hydrogen, Carbon, Nitrogen, Oxygen, Sodium, Magnesium, Phosphorous, Sulfur, Chlorine, Potassium, Calcium, Boron, Flourine, Chromium, Manganese, Iron, Cobalt, Copper, Zinc, Selenium, Molybdenum, and Iodine.


 * Yes you do need help. You need to learn to do your own homework. BTW, I suspect most of your answers are in the articles you linked to and a lot of the rest can easily be answered by understanding chemistry Nil Einne 20:42, 29 October 2006 (UTC)

Format
Article changed over to new WikiProject Elements format by David M. Elementbox converted 16:07, 23 Jun 2005 by Femto (previous revision was that of 15:17, 20 Jun 2005).

Hydrogen Quantum
I made this image a while back, and someone suggested working it into this article... I don't know where it would fit, but it is relevant. PoorLeno (talk) 20:12, 22 March 2009 (UTC)

User's comment
The specific heat is given for the H2, although 99% of Hydrogen is of the H1 variety. I find it confusing. —The preceding unsigned comment was added by Special:Contributions/ (talk)

Hydrogen has one valence electron —Preceding unsigned comment added by 169.204.230.6 (talk) 16:53, 22 October 2008 (UTC)

Information Sources
Some of the text in this entry was rewritten from Los Alamos National Laboratory - Hydrogen. Additional text was taken directly from the Elements database 20001107 (via dict.org), Webster's Revised Unabridged Dictionary (1913) (via dict.org) and WordNet (r) 1.7 (via dict.org). Data for the table was obtained from the sources listed on the main page and WikiProject Elements but was reformatted and converted into SI units.

The spin of a hydrogen atom
What is the spin of a single hydrogen atom?


 * Pretty much the intrinsic spin of its lone electron. There is no angular momentum in the 1s orbital, and the intrinsic spin of the proton is less than 1/600th as much, and doesn't contribute in a significant way (although of course there are energy differences betweeen electron and proton spin alignments-- that's the famous 21 cm microwave line).


 * The spin of the proton is the same as that of the electron. Its magnetic moment is much smaller.
 * Shambolic Entity 03:44, 25 January 2007 (UTC)

Hydrogen energy carrier or source of fuel or energy?
gas cost money to make it useable to cars but they hike up the price so it evens out economics but w/e hydrogen is also found in the ground in texas or is that helium i am not sure. I think it is a fuel.Barry White 06:06, 12 September 2006 (UTC)

Liquid hydrogen - Hydrogen merge
I'm proposing the merger because the liquid hydrogen article seems rather short and would probably be totally covered by the contents of this one. After all the liquid form is just a part of the desciption of the full molecule? - Dammit 09:22, 13 September 2006 (UTC)

Strong against merge, The article hydrogen is about hydrogen physics and on a atomic level, where as liquid hydrogen is a fuel. Mion 13:35, 13 September 2006 (UTC)

I vote against the merge. There should be some uniformity in how this is treated in the various articles on elements. Helium, which is a featured article, has Liquid helium broken out as a seperate article. The Liquid nitrogen article on the other hand simply redirects to the Nitrogen article. To me the Helium template makes more sense since I think there is enough material out there to write a full article on Liquid Hydrogen that would otherwise bloat the Hydrogen article. The Liquid Hydrogen article as it is right now is a stub and needs work.Badocter 04:45, 15 September 2006 (UTC)


 * Since consensus seems against the proposed merge, I've proposed an alternate merge to hydrogen economy, which seems to be where the applications of liquid hydrogen are. - User:Samsara (talk • contribs) 20:31, 16 September 2006 (UTC)

The arguments where to keep it at its own and give it a go to expand it, so i am against the new proposal, in itself you are right, every hydrogen related article is related to hydrogen economy, but the whole range about hydrogen is 80 to 100 articles and we cant put them all into hydrogen economy.it has to wait until we have a hydrogen portal, and yes you can start one, reg.Mion 00:18, 17 September 2006 (UTC)

Oppose This is a very unsuitable merger. Only part of the liquid hydrogen article relates to the topic, much of it relates to use in rockets. The best idea is to expand the liquid hydrogen article to cover things like its physics, its properties outside of fuel use, its presence in planets such as Jupiter, etc. Walkerma 04:14, 17 September 2006 (UTC)

Merge proposal is withdrawn, case is closed. -:). Mion 11:26, 17 September 2006 (UTC)

"H2" in applications section
I understand that it is important to emphasise whenever one is referring to diatomic hydrogen, but starting a sentence with a summation formula may seem somewhat unprofessional, and more importantly, it leads the line spacing to be upset in some browsers. Can we replace some of those "H2"s with real prose? Thanks. - User:Samsara (talk • contribs) 19:35, 19 September 2006 (UTC)

Hydrogen Compounds
It is mentioned that hydrogen forms compounds with elements which are more electronegative. If you look at an ordered electronegativity list you will realize that hydrogen bonds with many elements even more electropositive ones. Of course the electronegative elements such as the halogens react with hydrogen much more readily. A few examples of electroposative compounding: Lithium, Calcium, Copper, Silver, Sodium, Potassium, Rubidium, Cesium, Barium, Beryllium, magnesium, Uranium, Gadolinium. I keep going back and forth, searching element-hydrides. Every one I search for has a hydride. Maybe every element has a hydride (?) Scot.parker 20:30, 19 September 2006 (UTC)


 * I guess that technically, HF, HCl, HI etc. are not hydrides but chlorides, iodides, etc. I'd also have to guess that some of the noble gases may not form stable compounds with hydrogen. - User:Samsara (talk • contribs) 21:52, 19 September 2006 (UTC)


 * OK. I know about HeH+ and HArF all thanks to Wikipedia (tell Jimbo Wales it's a great project), and I heard about UuoH2 from WebElements -- but can the other noble gases, Ne, Kr, Xe and Rn form compounds with H? --116.14.27.127 (talk) 05:53, 3 June 2009 (UTC)

Hindenburg
Reading the wiki article on the Hindenburg disaster, I think it should be pointed out that the cause of the crash has not been 100% decided Mattmore17 19:07, 30 April 2007 (UTC)

The problem is, that the Hindenburg’s "shell" was coated with aluminum powder and iron oxide it help regulate temperature. Today this mixture is used as rocket fuel. If the Hindenburg was filled with (he) it still would have went down in about the same amount of time. Besides hydrogen is about as flammable as petrol.

Steven Loiselle, Mi

Amount of hydrogen in this universe
How much hydrogen is there in this universe? I thought that the amount was 90 %. So is 75 % correct?Hannu 11:03, 29 October 2006 (UTC)
 * If you'd read a little further, you would have noticed the reference given, which is a NASA web page and gives the figure as "three quarters":
 * http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/971113i.html
 * Samsara (talk • contribs) 11:09, 29 October 2006 (UTC)


 * Yes, but that's by mass, and more accurately, this universe's mass is 74% hydrogen. By number of atoms, it's closer to 92%. S  B Harris 21:36, 20 December 2006 (UTC)

Electrolysis of water
As the article stands now, there is only a single, two sentence line about electrolysis, and it is all the way down in the Laboratory Syntheses section.

"The electrolysis of water is a simple but expensive method of producing hydrogen. Typically the cathode electrode is made from platinum."

1st of all, this method is not more expensive than digging up fossil fuels, refining them, and then extracting the hydrogen. Currently, the amount of hydroxy gas (H H O or 2H2O(aq) → 2H2(g) + O2(g)) produced from water is very much relative to the set up of the system, the frequency used etc. Various voltages, amperages and frequencies have been used to various degrees of effectiveness. The cost is, of course, relative to the source of electricity used. There are many people who claim to be getting extremely high (even over unity) returns by using the resonant frequency of water. Regardless of whether these claims are true, this method should be given more than a cursory footnote, as it IS very simple.

2nd, produced on a mass scale (an ocean based plant using salt water and solar power for example) this method could be very reasonable, low maintenance, and environmentally friendly. Remember no greenhouse gasses are produced by electrolysis. Oh, and the cathode doesn't have to be platinum... it can be made from stainless steel or a number of other cheaper metals.

I propose mentioning this method and its long and successful history in the opening blurb, and giving Elecrolysis its own section. The article now makes it seem like hydrocracking is the only viable solution... and there are numerous problems with that method; not the least of which being the scarcity and growing expense of hydrocarbon fuels and the pollution associated with using them. The current article paints electrolysis as economically unfeasible and basically dismisses it off hand. —The preceding unsigned comment was added by JahSun (talk • contribs) 11:58, 29 October 2006 (UTC)


 * It's a good suggestion. Even better, write a small, separate article about the subject and then put a two-paragraph summary into this article, with a link to the more detailed stuff. Make sure you reference everything thoroughly, as this article is now a Featured Article, and hence, we have to keep up the quality. Good suggestions so far, always good to have knowledgeable people on board! Make sure you sign your posts using ~ . Use the preview to see what it does. - Samsara (talk • contribs) 12:06, 29 October 2006 (UTC)


 * Scary statement of the day "Regardless of whether these claims are true, this method should be given more than a cursory footnote, as it IS very simple."

Please dont insert your well-intentions but off-the-mark edits - you are talking to pseudo-science. No the electrode need not be Pt. But greenhouse gases are definitely generated by electrolysis (unless you subscribe to perpetual motion). Electrolysis is powered by electricity that is powered by the burning of fossil fuels (or hydroelectric, nuclear). So you are not going to get more energy out that you put in. Let experts in electrochemistry or electrical engineering make these edits, stick to making suggestions. BTW, hydrocarbons are not scarce - the US just does not like the owners of the reserves. And when we get done with petroleum, there is 1000x more natural gas. --Smokefoot 14:37, 29 October 2006 (UTC)

Electrolysis works. It's been known and used since Faraday, in the 19th century. It is not pseudo-science, and no one is talking about perpetual motion. Obviously electricity must be used, but hydro-electric, solar, wind, tidal, and geo-thermal power (among others) do not generate greenhouse gasses. BTW hydrocarbons are quite a bit more scarce than sea water...

JahSun 15:21, 29 October 2006 (UTC)

yes, but just try to burn that seawater... Yes, Echem generates H2, so what?? One consumes more energy than one inputs! Would be nice to see a scientific reference (a real journal with editors, referees and all that messy stuff) to the "Belona report" - which still looks like a commercial advertisement and may be erased later. --Smokefoot 15:36, 29 October 2006 (UTC)

Not sure what your gripe is. Hydrcracking uses more energy than it generates as well. Are you suggesting people shouldn't know about electrolysis because it obeys the law of conservation of energy? Oh, and you don't burn the sea water... you burn the gas that comes off the sea water after a current has been applied. Many of the methods of generating H2 mentioned in the article are less efficient than electrolysis or are even purely theoretical. (engineering cyanobaccilus to make hydrogen etc.) JahSun 15:56, 29 October 2006 (UTC)


 * To be fair to JahSun, I don't think the issue of whether or not eletrolysis is more polluting at the end of the day belongs within the scope of this article at all. We have a separate article on the hydrogen economy, where such issues can find their place. Regards, Samsara (talk • contribs) 16:05, 29 October 2006 (UTC)


 * thank you Samsara for politely helping me stay in-line. Back to you JahSun: okay maybe electrolysis should be considered for hydrogen production - I leave that call to the financially-guided engineers who run refineries.  But neither hydrocracking nor electrolysis is a route to energy, just a reshuffling of our energy content.  It was fun sparring with you, best wishes --Smokefoot 16:27, 29 October 2006 (UTC)


 * Likewise ;-) A good debate is healthy as long as no one takes it personally. All the best... JahSun 16:32, 29 October 2006 (UTC)

Um, people don't use reforming from natural gas to make hydrogen because they're dumb. You could burn natural gas to make heat to boil water to turn turbines to run generators to make electricity to run electrolysis plants. But it's more efficient to simply strip the H2 off the CH4 when you have it. On site H2 made this way is about .32 cents a lb, while electrolytically produced H2 is 3 to 6 times more expensive. . You want to demonstrate electrolysis is neat? Great. Produce hydrogen that way for less than 0.32 cents a lb., or point me to somebody who does. Have at it. S B Harris 23:27, 29 October 2006 (UTC)


 * The costs you speak of are relative, not fixed things. At the moment you are correct, but neglect to factor in the cost of acquiring the natural gas itself. On site hydrogen reforming may be cheap, but the cost of delivering liquid hydrogen fuel is nearly the same as electrolysis.  Furthermore, no one has mentioned the costs of electrolysis using hydro-electric power, tidal, or wind.  In an ocean based plant using the sea water (a natural electrolyte which electrolyzes better than pure water) with tidal power, wind, and solar operating in tandem the costs would be VERY cheap.  And, the costs must be considered to be amortized over the lifetime of the plant.  Solar panels, windmills, and tidal generators have a one-time, fixed cost, and then they run basically for free until repairs become necessary.


 * Statistics designed to make electrolysis of water look expensive are easy to fabricate. However, you must show where these supposed costs are coming from.  In addition, the people who claim that electrolysis of water is as polluting as hydrocracking always assume that the electricity must be generated by the burning of fossil fuels such as coal or natural gas.  People conveniently overlook all the factors that don't suit their basic belief or economic interest.  Take away the subsidies to the oil and gas industries, factor in the public health costs, add the money spent on security, and the transportation costs to bring it to market... and then see if it is truly cheaper. JahSun 13:08, 2 November 2006 (UTC)

atmospheric hydrogen
Is the amount of hydrogen gas being produced by us, or perhaps of some consequence of climate change at all significant in terms of changing the atmospheric concentration of hydrogen? What is the rate of flow of hydrogen gas from the atmosphere into space (and thus presumably the rate of production of the gas on land/sea)? Does hydrogen gas limit the decomposition of methane and carbon monoxide?

Also, is the absorption/emission spectrum of hydrogen such that it does function as a greenhouse gas? (I ask this regardless of whether the amount of hydrogen in the atmosphere is something that we have any control over.)

Diatomic gases such as Hydrogen gas cannot act as greenhouse gases. In order to absorb infrared radiation (which is a main characteristic of greenhouse gases), the molecule needs to perform asymmetric bending or rocking movements. This is not possible with diatomic compounds.

The other chemical implications of growing amounts of hydrogen gas that is being released into the atmophere have not been explored yet, such as decomposition of methane, carbon monoxide, VOCs, NOx or the ozone layer. —Preceding unsigned comment added by 193.5.216.100 (talk) 11:02, 14 January 2008 (UTC)

Validity of statement of the Hindenburg statement
"(Regardless of the cause of this fire, this was clearly primarily a hydrogen fire since skin of the Zeppelin alone would have taken many hours to burn)." I question this statement greatly. —The preceding unsigned comment was added by 71.98.7.154 (talk) 14:06, 15 May 2007 (UTC).

The skin was later found two have been made out of two highly flammable fabrics that are used to help make the fuel for rockets. Hydrogen didn't burn it down the fabric did. —Preceding unsigned comment added by 99.254.199.11 (talk) 21:04, 3 June 2008 (UTC)

Hydrogen 5
I read in the book Exempt from Disclosure: The Disturbing Case About the UFO Coverup, 2nd Edition, 2006 by Robert M. Collins, pages 159-161, that an alien energy device (ED) code named "Crystal Rectangle" recovered in June 1947 had been found to contain a sphere containing a hydrogen isotope of four neutrons. This device was reportedly loaned by the TI Advisory Group-6 to NASA and flown onboard and used during three U.S. Space Shuttle missions (STS-92, STS-97, and STS-106). The ED supplied voltage from 9 volts/0.5 amperes to 1100 volts/100 amperes. (Page 163, in op. cit., DIA Scientific Intelligence Report, Top Secret, 19 APR 2001, Top Secret Control NR: 01-04-2231-TI)

Our physicists have bombarded Tritium to make Hydrogen 5 which dissipated in nanoseconds. Perhaps an indirect process may be successful.
 * []
 * In 1939 Hans Bethe calculated the Sun's energy production, which results from the fusion of four hydrogen atoms (each of mass 1.008) into one helium atom (mass 4.0039). No direct fusion is possible, but Bethe showed that the probabilities of the four steps of the "carbon cycle" can account for the energy output. A carbon isotope of mass 12 reacts successively with three hydrogen nuclei (protons) to form the nitrogen isotope of mass 15; energy is produced through the fusion of a fourth hydrogen nucleus to release a helium nucleus (alpha particle) and the original carbon isotope.Larry R. Holmgren 20:41, 12 June 2007 (UTC)

Hydrogen plus oxygen equals an oxyhydrogen flame wich is so strong it can easily slice through steal.

Hydrogen abundance
The articles says this: Still, hydrogen is the third most abundant element on Earth. This does not sound correct to me. Oxygen Silicon Iron would all exceed Hydrogen in quantity. Can someone confirm this? GB 05:12, 25 July 2007 (UTC)
 * OK I checked the reference myself and it actually says on the earth's surface - not just making up the earth or its crust, so I changed text to say surface. GB 05:18, 25 July 2007 (UTC)
 * It would be better to pick a different reference that included the earths crust. See abundance of the chemical elements, as well as Abundances of the elements. 199.125.109.79 04:00, 28 September 2007 (UTC)
 * I would have expected earth's crust, that's what caused me to question this in the first place. If you count the number of atoms it gives hydrogen a big advantage. Graeme Bartlett 21:09, 30 September 2007 (UTC)

This article is missing the ionization energies of hydrogen.
9-12-06 —Preceding unsigned comment added by 70.134.57.120 (talk) 21:58, 12 September 2007 (UTC)

Lightest noble gas
is hydrogen the lightest noble gas? if not which one is ..please someone help me. does anyone one know which gas is put in the declarations case so it dosent fall apart? —Preceding unsigned comment added by 75.31.105.255 (talk) 23:35, 30 September 2007 (UTC)
 * Hydrogen is not a noble gas, Helium is the lightest noble gas. Graeme Bartlett (talk) 04:47, 22 November 2007 (UTC)

Inconsistency on Hydrogen's atomic radius
I have found that the Hydrogen's atomic radius shown in the atomic properties chart on the right side has a value of 25pm while in the article Atomic_radius it is shown that hydrogen has 75pm of atomic radius (stated by the reference: J.C. Slater, J. Chem. Phys. 1964, 41, 3199).

It would be great if anyone could verify and edit the information (I am not allowed to edit such data). I do not know how to notify this and I thought to post it in the discussion page. --18:30, 22 October 2007 (UTC)Tripplez

Oxygen Article Says Its The Third Most Abundant And The Hydrogen Article Says Its The Third Most Abundant!!!!!!!!

 * You have got to look at how it is counted and where. Hydrogen was counted as just the surface, and that gives the oceans a big influence.  If you count atoms hydrogen gets ahead because it is light. Oxygen is the most abundant element in the earth's crust. Hydrogen is the most abundant element in the universe. Graeme Bartlett (talk) 04:50, 22 November 2007 (UTC)

Page is protected? / solubility not important?
The small lock icon is not very obvious to a casual user, I had to study Template:Pp-semi-vandalism to figure out what is going on, but anyway; to the point: The "not" in the section "Chemistry" seems out of place. "The solubility and characteristics of hydrogen with various metals are not very important in metallurgy (as many metals can suffer hydrogen embrittlement) and in developing safe ways to store it for use as a fuel." Doesn't the sentence go on to say why is IS important? Perhaps someone someone who can edit the page could consider changing it? 71.212.26.92 (talk) 03:21, 30 November 2007 (UTC)


 * That bit of vandalism was never corrected. It's fixed now. Thanks. -- Squids ' and ' Chips  04:59, 30 November 2007 (UTC)

Enthalpy
"The enthalpy of combustion for hydrogen is – 286 kJ/mol"

I put a cite tag on this. It's been a while since I took Chemistry, but here are some references:


 * http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/electrol.html
 * http://hyperphysics.phy-astr.gsu.edu/Hbase/tables/therprop.html#c1
 * at 298K and 1 atmosphere pressure
 * Enthalpy of −285.83 kJ/mol for liquid water
 * Enthalpy of −241.82 kJ/mol for water vapor
 * 
 * "enthalpy of combustion of hydrogen of −241.8 kJ/mol H2."

Not sure what this means, but now we at least have refs. — Omegatron 17:45, 26 January 2008 (UTC)

also Talk:Oxyhydrogen and Oxy-fuel_welding_and_cutting — Omegatron 22:07, 26 January 2008 (UTC)

Hydrogen combustion
Possibly this is a dumb question, as it's been decades since I took college chemistry. If I have two moles of H2 and one mole of O2, for a total of 3 moles, that should burn to produce 572 kJ. Right? So shouldn't the energy produced in the "Combustion" section be 572/3 = 190.7 kJ/mol? Thanks.&mdash;RJH (talk) 21:25, 8 February 2008 (UTC)


 * No, the heat of combustion is defined per mole of the combustible substance (hydrogen in this case). Since the equation is 2H2 + O2 -> 2H2O, the heat of combustion is −572/2 kJ/mol, or −286 kJ/mol. On the other hand, if you were using the same equation to measure the heat of hydrogenation of oxygen, the value would be −572 kJ/mol since there is only one mole of oxygen. --Itub (talk) 17:13, 12 February 2008 (UTC)


 * Thank you.&mdash;RJH (talk) 19:40, 12 February 2008 (UTC)

"heat of combustion is defined per mole of the combustible substance"


 * Always? There's some confusion at Talk:Oxyhydrogen, since the gas being burned is a mixture. — Omegatron 16:56, 30 March 2008 (UTC)

So do I understand this correctly?


 * 2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ (285.83 kJ/mol)


 * 2 H2(g) + O2(g) → 2 H2O(g) + ___ kJ (241.82 kJ/mol)

And the extra heat output is from the state change of water from gas back to liquid? And this is the difference between the two types of Heating value? Which is the more typical measurement for a burning flame? — Omegatron 17:27, 30 March 2008 (UTC)


 * The difference is the heat of vaporization of water (or rather, the heat of condensation). In chemistry, heats of combustion are normally tabulated in kJ/mol or kcal/mol, which is per mole of the combustible substance. Other fields such as engineering may use other units that they find more practical, such as Mcal/kg or BTU/lb. The way it is traditionally measured, in a bomb calorimeter, the products include liquid water, since the system equilibrates at a temperature close to the original temperature of the bath, around room temperature. However, for the heat initially released by an open flame, I think it might be better to assume water vapor as a product, since the condensation of the water vapor may occur far away from the flame or not at all. --Itub (talk) 09:38, 31 March 2008 (UTC)


 * So 241.82 kJ/mol would be the "standard" way to refer to it, assuming "/mol" means per mole of hydrogen? — Omegatron 04:22, 4 April 2008 (UTC)

Missing deuterium reference
I was unable to find a suitable source for this statement:


 * Deuterium comprises 0.0027 – 0.0187% (by mole-fraction or atom-fraction) of hydrogen samples on Earth, with the lower number tending to be found in samples of hydrogen gas and the higher enrichments (0.015% or 150 ppm) typical of ocean water.

If you know of a proper reference, please let us know so we can add it back in. But for now it is unverified, so not suitable for an FA quality article.&mdash;RJH (talk) 20:10, 12 February 2008 (UTC)

Chemcial reactions in Production section
I have two suggestions: 1) Could someone add the energies to the chemical equations section?  (As is done in the section about Combustion.)  2) There is no  need to repeat links to the articles about the reactants so close together. (The earliest reference to carbon monoxide or water or methane should be linked to the appropriate articles; there is no need to repeat a link only a few lines later.) —Preceding unsigned comment added by 206.53.197.12 (talk) 02:04, 14 February 2008 (UTC)

Unsourced additions
The following material has been tagged as missing reference tags but no sources have been provided. As this is an FA article. I am moving the material here until suitable references can be located.


 * Treating the electron as a matter wave reproduces chemical results such as shape of the hydrogen atom more naturally than the particle-based Bohr model, although the energy and spectral results are the same. Modeling the system fully using the reduced mass of nucleus and electron (as one would do in the two-body problem in celestial mechanics) yields an even better formula for the hydrogen spectra, and also the correct spectral shifts for the isotopes deuterium and tritium. Very small adjustments in energy levels in the hydrogen atom, which correspond to actual spectral effects, may be determined by using a full quantum mechanical theory which corrects for the effects of special relativity (see Dirac equation), and by accounting for quantum effects arising from production of virtual particles in the vacuum and as a result of electric fields (see quantum electrodynamics).


 * In hydrogen liquid, the electronic ground state energy level is split into hyperfine structure levels because of magnetic effects of the quantum mechanical spin of the electron and proton. The energy of the atom when the proton and electron spins are aligned is higher than when they are not aligned. The transition between these two states can occur through emission of a photon through a magnetic dipole transition. Radio telescopes can detect the radiation produced in this process, which is used to map the distribution of hydrogen in the galaxy.

Thanks.&mdash;RJH (talk) 23:27, 29 February 2008 (UTC)
 * Ahem. After the important visitors have left the house, can we again pull out all the stuff out that we crammed under the beds and into the closets, so we can go on with living in the house, instead of creeping around in a museum? Wikipedia is supposed to be under construction. There are a lot of "unsourced" statements in it (in fact, there are more unsourced than sourced, for this is how articles grow), and quite often you'll find that this is merely because the needed sources are located in the articles on the linked terms, and haven't been mined out, duplicated, and stuck in. That usually is not grounds to delete an otherwise scientifically sound and non-controversial bit of explanatory writing which improves the encyclopedia. Yes, unsourced non-controversial writing DOES improve the encyclopedia. It is better than nothing at all. It simply invites addition of a tag, not deletion. Apparently, somebody has been looking at the language in BLP, which allows controverisal unsourced BLP info to be removed on sight, and has concluded that his also applies to unsourced noncontroversial info, in articles which are about to be reviewed! Say what? Well, I don't see any policy to that effect, and I think the harm to the encyclopedia is obvious. Don't delete stuff. Improve it. If you haven't got something better to put in place of something like the above, leave it alone.  S  B Harris 02:17, 1 April 2008 (UTC)


 * I agree in general, but in RJH's defense, he based his reason for the move in this being a featured article. Featured articles have stricter referencing standards than the average article, or else they risk becoming "unfeatured". Also, featured articles are supposed to be essentially "complete" (although they can still be improved). --Itub (talk) 06:07, 1 April 2008 (UTC)
 * Where does it say THAT? I can make as good an argument that a "featured" article is merely one that the community of people who happen to be working on it now, think is about as well as they personally can do with the personnel they have, with the time they have, and for now are sick of, anyway. The idea that it's somehow "complete" even approximately, is totally contrary to the idea of both science and the encyclopedia. It's the sort of reactionary idea I expect to see from writers and scientists who "died" a long time ago, but just haven't been buried yet. S  B Harris 17:05, 1 April 2008 (UTC)


 * I'm just saying that based on what I've seen happen at Featured article review, which is where articles get de-featured. You can check the criteria at WP:FACR. What I called "completeness" (note the scare quotes) is based on the criteria about comprehensiveness and stability. --Itub (talk) 13:16, 2 April 2008 (UTC)

Announcement
We've been working hard trying to find good sources for the information in this article so it can pass FARC. Additions to the article are welcome, but please cite your sources when doing so! Don't make our job any harder.

Stone, you have been making some good changes, but I commented out the section on "mono-atomic" hydrogen. There obviously had to have been a source for this information. Cite it. --Cryptic C62 · Talk 16:52, 9 April 2008 (UTC)


 * That section was merged in by me from the former Nascent hydrogen article. That article cited no sources. The information was clearly more useful here than there, which is why I merged it. The way, the truth, and the light (talk) 17:05, 9 April 2008 (UTC)

Hydrogen difficult to generate?
From the article, "Although H atoms and H2 molecules are abundant in interstellar space, they are difficult to generate, concentrate, and purify on Earth". It is my understanding that hydrogen can be generated by simply running an electric current through water. This is not difficult. --Xyzzyplugh (talk) 19:34, 14 March 2008 (UTC)
 * The "difficult" part may mean that the energy cost to extract hydrogen from water is relatively high. Or at least it was; that may be changing.&mdash;RJH (talk) 19:57, 14 March 2008 (UTC)
 * No, it will always require more energy to get hydrogen out of water than you get when burning it or using it in a fuel cell. That's not true of extraction of hydrgen from natural gas (as we do now), but that solves no carbon problems, which is the whole purpose of most of the proposed new hydrogen economy. S  B Harris 20:55, 14 March 2008 (UTC)
 * You misunderstood me once again, but I can't be bothered to argue.&mdash;RJH (talk) 21:01, 14 March 2008 (UTC)
 * The fact that it requires more energy to extract hydrogen from water than you'd get back by using the hydrogen as fuel does not make hydrogen difficult to generate or concentrate or purify. I'm going to remove the sentence, as it's simply not accurate.  --Xyzzyplugh (talk) 19:20, 15 March 2008 (UTC)
 * Accuracy has nothing to do with it, as difficulty is relative and needs qualifiers and references. Is it "accurate" to say that Für Elise is hard to play on the piano, or easy to play? That's sort of the thing we have here. A kg of hydrogen is easier to prepare than a kg of fluorine, but not as easy as a kg of gasoline. S  B Harris 07:28, 20 April 2008 (UTC)
 * (I wonder how well electrolysis can be scaled up?) How about something like "difficult to generate, concentrate, and purify efficiently and economically  on Earth" ?

Hydrogen is very easy to obtain. Any interested child with a battery an a couple of wires can make it at home. The main objection here seems to be about its expense and energy balance in the context of use as a fuel. If you are talking about price, give prices. If you are talking about energy, mention energy. But "difficulty" is too vague and subjective. --Itub (talk) 10:07, 23 April 2008 (UTC)
 * Since price can vary in a short amount of time, I favor something in the article that discusses the energy costs of obtaining hydrogen. 206.53.196.60 (talk) 19:05, 6 September 2009 (UTC)

Pauling's Electronegativity
In the article the electronegativity is 2.1, but on Electronegativity and my periodic table...it has it listed as 2.20. Which one is right? Mike6271 (talk) 00:45, 27 March 2008 (UTC)


 * It is 2.20 according to all the references listed at Electronegativities of the elements (data page), so I'll change it in this article for consistency. --Itub (talk) 10:35, 27 March 2008 (UTC)

Hydrogen donor merger as per header?
This means something in certain kinds of acid-base chemistry, but needs its own article anyway, and surely does not need to disappear and be crammed into this broad article. There's a lot of uses for hydrogen in chemistry, and they can't all be merged here. In fact, hardly any can. This is a broad review article. S B Harris 07:16, 20 April 2008 (UTC)


 * Oppose merge - it makes the main article too big and at an unsuitable level for the people who would want to read it. Graeme Bartlett (talk) 08:47, 20 April 2008 (UTC)


 * I merged Hydrogen donor into Brønsted-Lowry acid-base theory, a much better target and where the synonymous proton donor already redirected. The way, the truth, and the light (talk) 10:02, 20 April 2008 (UTC)

Monoatomic hydrogen
This entire section is dubious and should be deleted. The term "nascent hydrogen" is used only by quacks. The section contains several factual errors on temperature and energy to form atomic hydrogen.


 * The above user, who has failed to sign, is ignorant. The term 'nascent hydrogen' has a respectable scientific history and is not 'only used by quacks'. In addition his labeling my reverts 'vandalism' in edit summaries is uncivil at least. He should be ignored. The way, the truth, and the light (talk) 17:31, 21 April 2008 (UTC)

A search of Yahoo reveals about a dozen uses of the term "nascent hydrogen" by quacks such as http://www.chechfi.ca/pdfs/hydrogen_injection.pdf. If the term means anything, it means newly made hydrogen such as from electrolysis. Such hydrogen is never "atomic hydrogen". No academic or professional references to nascent hydrogen are available. This term is not used by people who know what they are doing.Trojancowboy (talk) 19:12, 21 April 2008 (UTC)

This is supposed to be a scientific article, not one on cult science. It appears that it is approaching the time for Dispute_resolution or an editing block on the vandal. Trojancowboy (talk) 19:34, 21 April 2008 (UTC)


 * User:The way, the truth, and the light was recently blocked for sockpuppetry. In light of this information, I am going to return all disputed content to its original page. Hooray. --Cryptic C62 · Talk 19:58, 12 May 2008 (UTC)