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