Polyatomic ions

NH4 +1

Ammonium

H3O +1

Hydronium

OH -1

Hydroxide

CN -1

Cyanide

O2 2-

Peroxide

CO3 2-

Carbonate

C2O4 2-

Oxalate

NO2 -1

Nitrite

NO3 -1

Nitrate

PO3 3-

Phosphite

PO4 3-

Phosphate

SO3 2-

Sulfite

SO4 2-

Sulfate

S2O3 2-

Thiosulfate

ClO -1

Hypochlorite

ClO2 -1

Chlorite

ClO3 -1

Chlorate

ClO4 1-

Perchlorate

C2H3O2 -1

Acetate

AsO4 3-

Arsenate

BO3 3-

Borate

SiO3 2-

Silicate

MnO4 1-

Permanganate

CrO4 2-

Chromate

Cr2O7 2-

Dichromate

HCO3 -1

Bicarbonate

HSO4 -1

Bisulfate

HPO4 2-

hydrogen phosphate