Common Polyatomic Ions

acetate

CH3COO

 

(or C2H3O2)

cyanide
CN
hydroxide
OH
hypochlorite
ClO
chlorite
ClO2
chlorate
ClO3
perchlorate
ClO4
nitrite
NO2
nitrate
NO3
permanganate
MnO4
carbonate
CO32-

hydrogen carbonate

 

(or bicarbonate)

HCO3
chromate
CrO42-
dichromate
Cr2O72-
peroxide
O22-
phosphate
PO43-
hydrogen phosphate
HPO42-
dihydrogen phosphate
H2PO4
sulfite
SO32-
sulfate
SO42-

hydrogen sulfate

 

(or bisulfate)

HSO4

Naming oxoanions:

 

prefixes & suffixes as # of O atoms increases

hypo- (root) -ite

          (root) -ite

          (root) -ate

  per- (root) -ate

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