polyatomic ion list

ammonium

NH4+

acetate

C2H3O2- or CH3COO-

bromate

BrO3-

chlorate

ClO3-

chlorite

ClO2-

cyanide

CN-

hydrogen carbonate (bicarbonate)

HCO3-

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