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Cr2+
chromium (II)
Cr3+
chromium (III)
Fe2+
iron (II)
Fe3+
iron (III)
Co2+
cobalt (II)
Co3+
cobalt (III)
Cu+
copper (I)
Cu2+
copper (II)
Sn2+
tin (II)
Sn4+
tin (IV)
Hg2+
mercury (I)
Hg2+
mercury (II)
Pb2+
lead (II)
Pb4+
lead (IV)