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Chromium multiple oxidation states
Cr2+, Cr3+
Cobalt multiple oxidation states
Co2+, Co3+
Copper multiple oxidation states
Cu+, Cu2+
Gold multiple oxidation states
Au+, Au3+
Mercury(I) multiple oxidation states
Hg2^2+
Mercury(II) multiple oxidation states
Hg2+
Iron multiple oxidation states
Fe2+, Fe3+
Nickel multiple oxidation states
Ni2+, Ni3+
Tin multiple oxidation states
Sn2+, Sn4+
Lead multiple oxidation states
Pb2+, Pb4+