Ion naming systems

Iron (lower) Classic

ferrous ion (Fe^2+)

Iron (higher) Classic

ferric ion (Fe^3+)

Iron (lower) Stock

Iron (II) ion

Iron (higher) Stock

Iron (III) ion

Copper (lower) Classic

Cuprous ion (Cu^+)

Copper (higher) Classic

Cupric ion (Cu^2+)

Copper (lower) Stock

Copper (I) ion

Copper (higher) Stock

Copper (II) ion

Chromium (lower) Classic

Chromous ion (Cr^2+)

Chromium (higher) Classic

Chromic ion (Cr^3+)

Chromium (lower) Stock

Chromium (II) ion

Chromium (higher) Stock

Chromium (III) ion

Cobalt (lower) Classic

Cobaltous (Co^2+)

Cobalt (higher) Classic

Cobaltic (Co^3+)

Lead (lower) Both

Plumbous ion (Pb^2+) or Lead (II) ion

Lead (higher) Both

Plumbic ion (Pb^4+) or Lead (IV) ion

Tin (lower) Both

Stannous ion (Sn^2+) or Tin (II) ion

Tin (higher) Both

Stannic ion (Sn^4+) or Tin (IV) ion

Mercury (lower) Both

Mercurous ion (Hg2^2+) or Mercury (I) ion

Mercury (higher) Both

Mercuric ion (Hg^2+) or Mercury (II) ion