polyatomic ions

H2PO4 1-

Dihydrogen phosphate

C2H3O2 1-

acetate

HSO3 1-

hydrogen sulfite

HSO4 1-

Hydrogen sulfate

HCO3 1-

Hydrogen carbonate

NO2 1-

nitrite

NO3 1-

nitrate

CN 1-

cyanide

OH 1-

hydroxide

MnO4 1-

Permanganate

ClO 1-

Hypochlorite

ClO2 1-

Chlorite

ClO3 1-

Chlorate

ClO4 1-

Perchlorate

HPO4 2-

Hydrogen phosphate

C2O4 2-

Oxalate

SO3 2-

Sulfite

SO4 2-

sulfate

CO3 2-

Carbonate

Cr2O7 2-

Dichromate

SiO3 2-

Silicate

PO3 3-

phosphite

PO4 3-

Phosphate

NH4 1+

Ammonium

CrO4 2-

Chromate