+
NH4
NO2
NO3
-
CN
-
HCO3
OH
MnO4
ClO
-
ClO2
IO3
ClO3
IO4
ClO4
C2H3O2- or CH3COO-
BrO3
H2PO4
2CO3
2SO3
2SO4
2S2O3
2O2
2CrO4
2Cr2O7
2HPO4
3PO4
H3O
3AsO4
HCO3
HSO4
+
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Common Polyatomic Ions
Ion Name
ammonium
hydronium
nitrate
nitrite
hydroxide
cyanide
permanganate
hydrogen carbonate
hypochlorite
chlorite
chlorate
perchlorate
bromate
iodate
periodate
Formula
NH4+
H3O+
NO2NO3OHCNMnO4HCO3ClOClO2ClO3ClO4BrO3IO3IO4-
Ion Name
acetate
dihydrogen phosphate
hydrogen carbonate
hydrogen sulfate
carbonate
sulfite
sulfate
thiosulfate
peroxide
chromate
dichromate
hydrogen phosphate
phosphate
arsenate
Formula
C2H3O2H2PO4HCO3HSO4CO32SO32SO42S2O32O22CrO42Cr2O72HPO42PO43AsO43-