Copper ions
Cu + Copper (I) ion
Cu 2+ Copper (II) ion
Iron ions
Fe 2+ Iron (III) ion
Fe 3+ Iron (IV) ion
Cobalt ions
Co 2+ Cobalt (II) ion
Co 3+ Cobalt (III) ion
Nickel ions
Ni 2+, Ni 3+
chromium ions
Cr 2+, Cr 3+
manganese ions
Mn 2+, Mn 3+
tin ions
Sn 2+, Sn 4+
Lead ions - plumbous/plumbic
Pb 2+, Pb 4+