metals with multiple cations

Chromium (II) [Chromous]

$$Cr^{2+}$$

Chromium (III) [Chromic]

$$Cr^{3+}$$

iron (II) [Ferrous]

$$Fe^{2+}$$

iron (III) [Ferric]

$$Fe^{3+}$$

copper (I) [Cuprous]

$$Cu^{+}$$

copper (II) [Cupric]

$$Cu^{2+}$$

tin (II) [stannous]

$$Sn^{2+}$$

tin (IV) [Stannic]

$$Sn^{4+}$$

mercury (I) [mercurous]

$$Hg2^{2+}$$

mercury (II) [mercuric]

$$Hg^{2+}$$

lead (II) [plumbous]

$$Pb^{2+}$$

lead (IV) [plumbic]

$$Pb^{4+}$$