Common Polyatomic Ions

Ammonium

NH4+

Remember: Ammonium is the ONLY positive polyatomic ion.

nitrite
NO2
Nitrate
NO3
Sulfite
SO32–
Sulfate
SO42–
hydrogen sulfate (bisulfate)
HSO4
Hydroxide
OH
Cyanide
CN
Phosphate
PO43–
Hydrogen phosphate
HPO42–
dihydrogen phosphate
H2PO4
carbonate
CO32–
hydrogen carbonate (bicarbonate)
HCO3
hypochlorite
ClO
chlorite
ClO2
chlorate
ClO3
perchlorate
ClO4
acetate
C2H3O2
permanganate
MnO4–
Dichromate
Cr2O72–
Chromate
CrO42–
Peroxide
O22–
x

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