Polyatomic ions

H3O+
hydronium ion
NH4+
ammonium ion
CH3CO2-
acetate ion
CO3-2
carbonate ion
HCO3-
hydrogen carbonate ion (bicarbonate)
CrO4-2
chromate ion
Cr2O7-2
dichromate ion
CN-
cyanide ion
OH-
hydroxide ion
OCl-
hypochlorite ion
NO3-
nitrate ion
NO2-
nitrite ion
C2O4-2
oxalate ion
MnO4-
permanganate ion
PO4-3
phosphate ion
HPO4-2
hydrogen phosphate ion
H2PO4-
dihydrogen phosphate ion
SO4-2
sulfate ion
HSO4-
hydrogen sulfate ion (bisulfate ion)
SO3-2
sulfate ion
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