Polyatomic ions

Phosphite

PO3 3-

Phosphate

PO4 3-

Sulfite

SO3 2-

Sulfate

SO4 2-

Ammonium

NH4+

Nitrite

NO2-

Nitrate

NO3-

Peroxide

O2 2-

Hydroxide

OH-

Acetate

C2H3O2-

Oxalate

C2O4 2-

Cyanide

CN-

Carbonate

CO3 2-

Hypochlorite

ClO-

Chlorite

ClO2-

Chlorate

ClO3-

Perchlorate

ClO4-

Hydrogen carbonate

HCO3-

Permanganate

MnO4-