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-ic/ous= Stock Method | Roman Numerals= Modern Method
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Cr2+
Chromous
Chromium (II)
Cr3+
Chromic
Chromium (III)
Fe2+
Ferrous
Iron (II)
Fe3+
Ferric
Iron (III)
Co2+
Cobaltous
Cobalt (II)
Co3+
Cobaltic
Cobalt (III)
Ni2+
Nickelous
Nickel (II)
Ni3+
Nickelic
Nickel (III)
Cu+
Cuprous
Copper (I)
Cu2+
Cupric
Copper (II)
Sn2+
Stannous
Tin (II)
Sn4+
Stannic
Tin (IV)
Pb2+
Plumbous
Lead (II)
Pb4+
Plumbic
Lead (IV)
Hg 2 2+
(subscript 2, then superscript 2+)
Mercurous
Mercury (I)
Hg2+
Mercuric
Mercury (II)