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Bismuth
III
V
Chromium
II
III
Cobalt
II
III
Copper
I
II
Gold
I
III
Iron
II
III
Lead
II
IV
Manganese
II
III
Mercury
I (forms an ion pair with a 2+ charge → Hg22+)
II
Nickel
II
III
Tin
II
IV
Zinc
Fixed charge of 2+