Variable Valence

Copper (I) Cu+

Copper (II) Cu2+

Mercury (I) Hg+

Mercury (II) Hg2+

Gold (I) Au+

Gold (III) Au3+

Colbalt (II) Co2+

Colbalt (III) Co3+

Chromium (II) Cr2+

Chromium (III) Cr3+

Iron (II) Fe2+

Iron (III) Fe3+

Manganese (II) Mn2+

Manganese (IV) Mn4+

Platinum (II) Pt2+

Platinum (IV) Pt4+

Tin (II) Sn2+

Tin (IV) Sn4+

Arsenic (III) As3+

Arsenic (V) As5+

Antimony (III) Sb3+

Antimony (V) Sb5+