Common Polyatomic Ions

Hydroxide

OH 1-

Nitrate

NO3 1-

Nitrite

NO2 1-

Perchlorate

ClO4 1-

Chlorate

ClO3 1-

Chlorite

ClO2 1-

Hypochlorite

ClO 1-

Acetate

C2H3O2 1-

Permanganate

MnO4 1-

Sulfate

SO4 2-

Sulfite

SO3 2-

Carbonate

CO3 2-

Chromate

CrO4 2-

Dichromate

Cr2O7 2-

Peroxide

O2 2-

Phosphate

PO4 3-

Phosphite

PO4 2-

Ammonium

NH4 1+