polyatomic ions

ammonium
NH4+
acetate
C2H3O2- or CH3COO-
bromate
BrO3-
chlorate
ClO3-
chlorite
ClO2-
cyanide
CN-
hydrogen carbonate or bicarbonate
HCO3-
hydroxide
OH-
hypochlorite
ClO-
iodate
IO3-
nitrate
NO3-
nitrite
NO2-
permanganate
MnO4-
perchlorate
ClO4-
carbonate
CO3 -2
chromate
CrO4 -2
dichromate
Cr2O7 -2
oxalate
C2O4 -2
peroxide
O2 -2
sulfite
SO3 -2
sulfate
SO4 -2
phosphite
PO3 -3
phosphate
PO4 -3
arsenate
AsO4 -3
x

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