Common Cations
| aluminum | Al3+ | lead | Pb2+ | |
| ammonium | NH4+ | lithium | Li+ | |
| barium | Ba2+ | magnesium | Mg2+ | |
| calcium | Ca2+ | manganese (II) manganous | Mn2+ | |
|
chromium (II) chromous
chromium (III) chromic |
Cr2+
Cr3+ |
mercury (I) mercurous
mercury (II) mercuric |
Hg22+
Hg2+ |
|
|
copper (I) cuprous
copper (II) cupric |
Cu+
Cu2+ |
potassium
silver |
K+
Ag+ |
|
|
hydrogen
hydronium |
H+
H3O+ |
sodium | Na+ | |
|
iron (II) ferrous
iron (III) ferric |
Fe2+
Fe3+ |
tin (II)
tin (IV) |
Sn2+
Sn4+ |
|
| zinc | Zn2+
|
Notice that the lowest oxidation state of two ions of the same atom carries the ending "-ous."
The highest oxidation state of two ions of the same atom carries the ending "-ic."