Polyatomic Ions

Common Polyatomic Ions for Chemistry

Acetate

C₂H₃O₂^- or CH₃COO^-

Ammonium

NH₄⁺

Arsenate

AsO₄^3-

Arsenite

AsO₃^3-

Azide

N₃^-

Benzoate

C₇H₅O₂^-

Borate

BO₃^3-

Bromate

BrO₃^-

Carbonate

CO₃^2-

Chlorate

ClO₃^-

Chlorite

ClO₂^-

Chromate

CrO₄^2-

Cyanide

CN^-

Dichromate

Cr₂O₇^2-

Dihydrogen Phosphate

H₂PO₄^-

Dihydrogen Phosphite

H₂PO₃^-

Hydrogen Carbonate

HCO₃^-

Hydrogen Phosphate

HPO₄^2-

Hydrogen Phosphite

HPO₃^-

Hydrogen Sulfate

HSO₄^-

Hydrogen Sulfide

HS^-

Hydrogen Sulfite

HSO₃^-

Hydroxide

OH^-

Hypochlorite

ClO^-

Iodate

IO₃^-

Manganate

MnO₄^2-

Nitrate

NO₃^-

Nitrite

NO₂^-

Oxalate

C₂O₄^2-

Perchlorate

ClO₄^-

Permanganate

MnO₄^2-

Peroxide

O₂^3-

Phosphate

PO₄^2-

Phosphite

PO₃^2-

Silicate

SiO₃^2-

Sulfate

SO₄^2-

Sulfite

SO₃^2-

Tartrate

C₄H₄O₆^2-

Thiocyanate

SCN^-

Thiosulfate

S₂O₃^2-