Polyatomic anions + Important Compound

Sulfate Ion

SO₄^2-

Sulfite Ion

SO₃^2-

Thiosulfate Ion

S₂O₃^2-

Hydrogen Sulfate Ion

HSO₄^-

Nitrite Ion

NO₂^-

Nitrate Ion

NO₃^-

Hypochlorite Ion

ClO^-

Chlorite Ion

ClO₂^-

Chlorate Ion

ClO₃^-

Perchlorate Ion

ClO₄^-

Phosphate Ion

PO₄^3-

Hydrogen Phosphite Ion

HPO₃^2-

Hydrogen Phosphate Ion

HPO₄^2-

Dihydrogen Phosphate Ion

H₂PO₄^-

Carbonate Ion

CO₃^2-

Hydrogen Carbonate Ion or Bicarbonate Ion

HCO₃^-

Cyanide Ion

CN^-

Acetate Ion

CH₃COO^- or C₂H₃O₂^-

Chromate Ion

CrO₄^2-

Dichromate Ion

Cr₂O₇^2-

Hydroxide Ion

OH^-

Peroxide Ion

O₂^2-

Permanganate Ion

MnO₄^-

Borate Ion

BO₃^3-

Fluoride Ion

F^-

Chloride Ion

Cl^-

Bromide Ion

Br^-

Iodide Ion

I^-

Oxide Ion

O^2-

Sulfide Ion

S^2-

Ammonia

NH₃

Ammonium

NH₄⁺

Hydrogen Peroxide

H₂O₂