| Cations (Common) |
| Positive Ions (cations) | |
| Aluminum | Al3+ |
| Ammonium | NH4+ |
| Antimony (III) | Sb3+ |
| Antimony (V) | Sb5+ |
| Arsenic (III) | As3+ |
| Arsenic (V) | As5+ |
| Barium | Ba2+ |
| Beryllium | Be2+ |
| Bismuth (III) | Bi3+ |
| Bismuth (V) | Bi5+ |
| Cadmium | Cd2+ |
| Calcium | Ca2+ |
| Chromium (II) | Cr2+ |
| Chromium (III) | Cr3+ |
| Cobalt (II) | Co2+ |
| Cobalt (III) | Co3+ |
| Copper (I) | Cu+ |
| Copper (II) | Cu2+ |
| Hydrogen, hydronium ** | H + , H3O+ |
| Iron (II) (Ferrous) | Fe 2+ |
| Iron (III) (Ferric) | Fe 3+ |
| Lead (II) | Pb 2+ |
| Lead (IV) | Pb 4+ |
| Lithium | Li+ |
| Magnesium | Mg2+ |
| Manganese (II) | Mn2+ |
| Manganese (IV) | Mn4+ |
| Mercury (I)* | Hg22+ |
| Mercury (II) | Hg2+ |
| Nickel | Ni2+ |
| Oxonium ** | H3O+ |
| Potassium | K+ |
| Scandium | Sc2+ |
| Silver | Ag+ |
| Sodium | Na+ |
| Strontium | Sr2+ |
| Tin (II) | Sn2+ |
| Tin (IV) | Sn4+ |
| Zinc | Zn2+ |
| * Mercury (I) ions occur as groups of 2, its symbol is Hg2and its total charge is +2. | |
| ** The use of "Oxonium" is recommended instead of hydronium or hydroxonium. | |