Cation
Conversely, a positively-charged ion, which has fewer electrons than protons, is known as a cation (κατά kata: Greek 'down') (Template:PronEng; cat-eye-on).
| Common Name | Formula | Historic Name |
|---|---|---|
| Simple Cations | ||
| Aluminium | Al3+ | |
| Barium | Ba2+ | |
| Beryllium | Be2+ | |
| Cadmium | Cd2+ | |
| Caesium | Cs+ | |
| Calcium | Ca2+ | |
| Chromium(II) | Cr2+ | Chromous |
| Chromium(III) | Cr3+ | Chromic |
| Chromium(VI) | Cr6+ | Chromyl |
| Cobalt(II) | Co2+ | Cobaltous |
| Cobalt(III) | Co3+ | Cobaltic |
| Copper(I) | Cu+ | Cuprous |
| Copper(II) | Cu2+ | Cupric |
| Copper(III) | Cu3+ | |
| Gallium | Ga3+ | |
| Helium | He2+ | (Alpha particle) |
| Hydrogen | H+ | (Proton) |
| Iron(II) | Fe2+ | Ferrous |
| Iron(III) | Fe3+ | Ferric |
| Lead(II) | Pb2+ | Plumbous |
| Lead(IV) | Pb4+ | Plumbic |
| Lithium | Li+ | |
| Magnesium | Mg2+ | |
| Manganese(II) | Mn2+ | Manganous |
| Manganese(III) | Mn3+ | Manganic |
| Manganese(IV) | Mn4+ | Manganyl |
| Manganese(VII) | Mn7+ | |
| Mercury(II) | Hg2+ | Mercuric |
| Nickel(II) | Ni2+ | Nickelous |
| Nickel(III) | Ni3+ | Nickelic |
| Potassium | K+ | |
| Silver | Ag+ | |
| Sodium | Na+ | |
| Strontium | Sr2+ | |
| Tin(II) | Sn2+ | Stannous |
| Tin(IV) | Sn4+ | Stannic |
| Zinc | Zn2+ | |
| Polyatomic Cations | ||
| Ammonium | NH4+ | |
| Hydronium | H3O+ | |
| Nitronium | NO2+ | |
| Uranyl | UO22+ | |
| Mercury(I) | Hg22+ | Mercurous |