Metals that form more than one montamic ion

Chromium(II)
Cr2+
Chromiuim(III)
Cr3+
Cobalt(II)
Co2+
Cobalt(III)
Co3+
Copper(I)
Cu+
Copper(II)
Cu2+
Iron(II)
Fe2+
Iron(III)
Fe3+
Lead(II)
Pb2+
Lead(IV)
Pb4+
Mercury(I)
Hg22+
Mercury(II)
Hg2+
Tin(II) 
Sn2+
Tin(IV)
Sn4+
x

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