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| Cations: Variable Valence | ||
| Ion | Systematic Name | Alternative Name |
| Cu+ | Copper (I) | Cuprous |
| Cu2+ | Copper (II) | Cupric |
| Hg+ | Mercury (I) | Mercurous |
| Hg2+ | Mercury (II) | Mercuric |
| Note: Mercury (I) ions always occur bound together to form Hg22+ ions. | ||
| Au+ | Gold (I) | Aurous |
| Au3+ | Gold (III) | Auric |
| Co2+ | Colbalt (II) | Cobaltous |
| Co3+ | Colbalt (III) | Cobaltic |
| Cr2+ | Chromium (II) | Chromous |
| Cr3+ | Chromium (III) | Chromic |
| Fe2+ | Iron (II) | Ferrous |
| Fe3+ | Iron (III) | Ferric |
| Mn2+ | Manganese (II) | Manganous |
| Mn4+ | Manganese (IV) | Manganic |
| Pt2+ | Platinum (II) | Platinous |
| Pt4+ | Platinum (IV) | Platinic |
| Sn2+ | Tin (II) | Stannous |
| Sn4+ | Tin (IV) | Stannic |
| As3+ | Arsenic (III) | Arsenous |
| As5+ | Arsenic (V) | Arsenic |
| Sb3+ | Antimony (III) | Antimonous |
| Sb5+ | Antimony (V) | Antimonic |