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copper ions
1 2
gold ion
1 3
mercury (I) Hg2
2
silver ion
1
cadmium Cd
2
chromium
2 3
cobalt
2 3
iron
2 3
manganese
2
Mercury (II) Hg
2
nickel
2
platinum
2
tin Sn
2 4
zinc
2
lead Pb
2 4