common polyatomic ions

ammonium
NH4+
hydronium
H3O+
Acetate

CH3COO

or

C2H3O2

cyanide
CN
hydroxide
OH
hyperchlorite
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
x

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