Polyatomic Ion List

ammonium

NH4 +

acetate

C2H3O2 - or CH3COO -

bromate

BrO3 -

chlorate

ClO3 -

chlorite

ClO2 -

cyanide

CN -

hydrogen carbonate

HCO3 - (also called bicarbonate)

hydroxide

OH -

hypochlorite

ClO -

iodate

IO3 -

nitrate

NO3 -

nitrite

NO2 -

permanganate

MnO4 -

perchlorate

ClO4 -

thiocyanate

SCN -

carbonate

CO3 -2

chromate

CrO4 -2

dichromate

Cr2O7 -2

oxalate

C2O4 -2

peroxide

O2 -2

sulfate

SO4 -2

sulfite

SO3 -2

phosphate

PO4 -3

phosphite

PO3 -3

arsenate

AsO4 -3