Common Polyatomic Ions

1- Charge, 2- Charge, 3- Charge, 1+ Charge- Formulas and Names

H₂PO₄^-

Dihydrogen phosphate (1-)

C₂H₃O₂^-

Acetate (1-)

HSO₃^-

Hydrogen sulfite (-1)

HSO₄^-

Hydrogen sulfate (-1)

HCO₃^-

Hydrogen carbonate (1-)

NO₂^-

Nitrite (-1)

NO₃^-

Nitrate (-1)

CN^-

Cyanide (-1)

OH^-

Hydroxide (-1)

MnO₄^-

Permanganate (-1)

ClO^-

Hypochlorite (-1)

ClO₂^-

Chlorite (-1)

ClO₃^-

Chlorate (-1)

ClO₄^-

Perchlorate (-1)

HPO₄^2-

Hydrogen phosphate (-2)

C₂O₄^2-

Oxalate (-2)

SO₃^2-

Sulfite (-2)

SO₄^2-

Sulfate (-2)

CO₃^2-

Carbonate (-2)

CrO₄^2-

Chromate (-2)

Cr₂O₇^2-

Dichromate (-2)

SiO₃^2-

Silicate (-2)

PO₃^3-

Phosphite (-3)

PO₄^3-

Phosphate (-3)

NH₄⁺

Ammonium (+1)