User:YBG/List of aqueous ions/notes


 * The left side of the periodic table is dominated by elements with only positive aqueous ions, shown with solid orangish cells. This includes all of group 1 and most of group 2 and most of the lanthanides and actinides.
 * Elements which form simple cations can be found in all groups except 16 through 18.
 * Elements which form simple cations and no other aqueous ions include all of group 1, the heavier lanthanides and actinides, and lutetium and lawrencium in group 3.
 * The right side of the periodic table is dominated by elements with only negative aqueous ions, shown with solid solid blueish cells. This includes the early periods of groups 14 through 17.
 * Elements which form simple cations can be found only in groups 15, 16, and 17.
 * Elements which form simple cations and no other aqueous ions include only oxygen and fluorine, the first elements in groups 16 and 17 respectively.
 * The center of the periodic table is dominated by elements with both positive and negative ions, shown with diagonally split cells. This includes groups 4 through 12.
 * However, a block of six negative-ion-only elements appear in groups 5 through 8, far from the right side of the table where all other negative-ion-only elements are found.
 * Likewise, two adjacent positive-ion-only elements appear in groups 9 and 10, far from the left side of the table where all other positive-ion-only elements are found.
 * The rightmost column and bottom row are dominated by elements with no known aqueous ion species, shown with solid gray cells.
 * The noble gases (group 18) are generally reticent to react chemically at all.
 * The radioactive elements from rutherfordium (element 104) up, are difficult to study chemically due to short half-lives and the difficulty of obtaining macroscopic specimens.