Polyatomic Ions

Acetate
C2H3O2
Carbonate
CO32-
Hydrogen carbonate (bicarbonate)
HCO3
Hydroxide
OH
Nitrate
NO3
Nitrite 
NO2
Chromate 
CrO42-
Dichromate
Cr2O72-
Phosphate
PO43-
Hydrogen phosphate
HPO42-
Ammonium
NH4+
Hypochlorite 
ClO
Chlorite 
ClO2
Chlorate 
ClO3
Perchlorate 
ClO4
Permanganate 
MnO4
Sulfate 
SO42-
Sulfite 
SO32-
Hydrogen sulfite 
HSO3
Hydrogen sulfate 
HSO4
Peroxide 
O22-
Cyanide 
CN
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