NH₄⁺
Ammonium (polyatomic cations)
NH3
Ammonia
H3O+
Hydronium (polyatomic cation)
OH-
Hydroxide
CN-
Cyanide
O2 2-
Peroxide
CO3 2-
Carbonate
C2O4 2-
Oxalate
NO2-
Nitrite
PO3 3-
Phosphite
PO4 3-
Phosphate
SO3 2-
Sulfite
SO4 2-
Sulfate
S2O3 2-
Thiosulfate
CIO-
Hypochlorite
CIO2-
Chlorite
CIO3-
Chlorate
CIO4-
Perchlorate
CH3COO- or C2H3O2-
Acetate
AsO4 3-
Arsenate
BO3 3-
Borate
SiO3 2-
Silicate
MnO4-
Permanganate
CrO4 2-
Chromate
Cr2O7 2-
Dichromate
CHO 2-
Formate
HCO3-
Hydrogen carbonate or bicarbonate
HSO3-
Hydrogen sulfate or bisulfate
HPO4 2-
Hydrogen phosphate
H2PO4-
Dihydrogen phosphate