Polyatomic Ions

Ammonium 
NH4+
Hydronium 
H3O+
Bicarbonate 
HCO3
Cyanide
CN
Hydrogen Sulfate 
HSO4
Hydroxide 
OH
Nitrate 
NO3
Peroxide
O22-
Superoxide
O2
Triiodide
I3
Thiocyanate
SCN
Nitrite
NO2
Sulfite
SO32-
Bisulfite (hydrogen sulfite)
HS03
Sulfate
SO42-
Carbonate
CO32-
Phosphate
PO43-
Hydrogen Phosphate
HPO42-
Dihydrogen Phosphate
H2PO4
Hypochlorite
ClO
Chlorite
ClO2
Chlorate
ClO3
Perchlorate
ClO4
Acetate
CH3CO2
Permanganate
MnO4
Chromate
CrO42-
Dichromate
Cr2O72-
x

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