Polyatomic Ions

This is a fairly full listing of polyatomic ions.

NameFormula
ammonium NH4+
nitrite NO2
nitrate NO3
sulfite SO32–
sulfate SO42–
hydrogen sulfate
(aka: bisulfate)
HSO4
thiosulfate S2O32–
oxalate C2O42–
hydroxide OH
peroxide O22–
cyanide CN
phosphite PO33–
phosphate PO43–
hydrogen phosphate HPO42–
dihydrogen phosphate H2PO4
NameFormula
perchlorate ClO4
chlorate ClO3
chlorite ClO2
hypochlorite ClO
bromate BrO3
iodate IO3
acetate
acetate
CH3COO
C2H3O2
carbonate CO32–
hydrogen carbonate
(aka: bicarbonate)
HCO3
chromate CrO42–
dichromate Cr2O72–
permanganate MnO4
cyanate OCN
thiocyanate SCN


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