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Common Polyatomic Ions

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Ammonium ion
NH4(+)
Acetate ion
CH3COO(-)
Carbonate ion
CO3(2-)
Hydrogen carbonate ion
HCO3(-)
Hypochlorite ion
ClO(-)
Chlorite ion
ClO2(-)
Chlorate ion
ClO3(-)
Perchlorate ion
ClO4(-)
Chromate ion
CrO4(2-)
Dichromate ion
Cr2O7(2-)
Cyanide ion
CN(-)
Hydroxide ion
OH(-)
Nitrite ion
NO2(-)
Nitrate ion
NO3(-)
Oxalate ion
C2O4(2-)
Permanganate ion
MnO4(-)
Phosphate ion
PO4(3-)
Hydrogen phosphate ion
HPO4(2-)
Dihydrogen phosphate ion
H2PO4(-)
Sulfite ion
SO3(2-)
Hydrogen sulfite ion
HSO3(-)
Sulfate ion
SO4(2-)
Hydrogen sulfate ion
HSO4(-)
Thiosulfate ion
S2O3(2-)