Common Polyatomic Ions

C₂H₃O₂-

Acetate

CN-

Cyanide

ClO-

Hypochlorite

CLO₂-

Chlorite

ClO₃-

Chlorate

ClO₄-

Perchlorate

HCO₃-

Hydrogen Bicarbonate

H₂PO₄-

Dihydrogen Phosphate

HSO₃-

Hydrogen sulfite

HSO₄-

Hydrogen Bisulfate

MnO₄-

Permanganate

NCS-

Thiocynate

NO₂-

Nitrite

NO₃-

Nitrate

OH-

Hydroxide

C₂O₄^2-

Oxalate

CO_3^2-

Carbonate

CrO₄^2-

Chromate

Cr₂O₇^2-

Dichromate

HPO₄^2-

Hydrogen Phosphate

O₂^2-

Peroxide

SO₃^2-

Sulfite

SO₄^2-

Sulfate

SiO₃^2-

Silicate

AsO₄^3-

Arsenate

PO₃^3-

Phosphite

PO₄^3-

Phosphate

NH₄+

Ammonium