Common Polyatomic Ions

ammonium
NH4 +
nitrite
NO2 –
Nitrate
NO3 –
Sulfite
SO3 2-
sulfate
SO4 2-
hydrogen sulfate (bisulfate)
HSO4 –
Hydroxide
OH –
Cyanide
CN –
phosphate
PO4 3-
Hydrogen Phosphate
HPO4 2-
dihydrogen phosphate
H2PO4 –
carbonate
CO3 2-
hydrogen carbonate
HC03 –
hypochlorite
CLO –
Chlorate
CLO3 –
Perchlorate
CLO4 –
acetate
C2H3O2
permanganate
Mn04
dichromate
Cr2O7 2-
chromate
CrO4 2-
peroxide
O2 2-

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