Talk:Roentgenium

Electronegativity
What is predicted electronegativity for this element? Higher than 2,55 (electronegativity of C nad Se)? What with melting and boiling point? If it has very high electronegtivity, its compounds (especilly with hydrogen and alkali metls) wold have been very interesting. 178.42.151.221 (talk) 09:08, 20 October 2013 (UTC)
 * I don't think Rg will have that high an electronegativity. The 6d subshell is relativistically destabilized and it is not too hard to to breach it: even iodine is expected to be able to oxidize copernicium to the +4 state (with an open 6d8 configuration), showing that a full 6d10 shell would not be all that stable. While I wouldn't say that roentgenides aren't possible, I think the +3 and +5 states would be more stable, and that Rg(V) should be quite stable and common. So I would estimate Rg's electronegativity as only about 1.85: able to form anions, but unwilling to (and probably unstable in the −1 state), and quite oxidizable.
 * As Rg is expected to crystallize in bcc rather than fcc, I would expect a higher melting point, maybe around 1700 K. As for the boiling point, I would likewise expect a high value of 4100 K due to high atomic weight (281 amu) and density (28.7 g/cm3). Double sharp (talk) 10:08, 20 October 2013 (UTC)
 * Errata: changed erroneous "°C" to "K" in my post immediately above, and changed Rg's boiling point. Double sharp (talk) 10:52, 21 October 2013 (UTC)

Calculated electron affinity is ~1.6 eV, per Fricke. This lies between the values for Au (which forms anions) and Cu and Ag (which do not). Double sharp (talk) 10:38, 8 November 2016 (UTC)
 * An electronegativity scale for all elements by A. V. Kul'sha and T. A. Kolevich may be found at User:Double sharp/Electronegativity, in which Rg is assigned 1.99, just below boron at 2.00. (The scale ranges from Cs at 0.70 to Ne at 4.50; the period 2 elements are given values at intervals of 0.50 from Li at 1.00 to Ne at 4.50.) Double sharp (talk) 06:01, 11 February 2019 (UTC)

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