Ion Symbol & Name Rules
Cation (+) Ion Rules
Classical Names: Suffix -ic means greater positive charge
Suffix -ous means lesser positive charge
Stock Names: Roman Numerals indicate the positive charge
Odd Ions That Do Not Follow Cation Rules As Stated: NH41+
Anion (-) Ion Rules
Suffix -ate means the number of oxygens can be predicted by the Periodic Table.
Suffix -ite means one less oxygen than -ate. Yet both hold the same charge.
Odd Ions That Do Not Follow Anion Rules As Stated:
CN 1- cyanide OH 1- hydroxide C2H3O2 1- acetate MnO4 1- permanganate
ClO 1- hypochlorite hypo- prefix means under, so one oxygen under chlorite
ClO21- chlorite ClO31- chlorate
ClO41- perchlorate per- (hyper-) prefix means above, so one oxygen above chlorate
H2PO41- hydrogen biphosphate or dihydrogen phosphate Di- prefix means two
Cr2O7 2- dichromate C2O4 2- oxalate