Common Polyatomic Ions

These vocabulary flashcards present each polyatomic ion’s name alongside its chemical formula.

Acetate

C₂H₃O₂^- or CH₃COO^-

Amide

NH₂^-

Bicarbonate

HCO₃^-

Bisulfate

HSO₄^-

Bisulfite

HSO₃^-

Bromate

BrO₃^-

Bromite

BrO₂^-

Formate

CHO₂^- or CHOO^-

Chlorite

ClO₂^-

Chlorate

ClO₃^-

Perchlorate

ClO₄^-

Cyanide

CN^-

Dihydrogen phosphate

H₂PO₄^-

Hydroxide

OH^-

Iodate

IO₃^-

Iodite

IO₂^-

Nitrate

NO₃^-

Nitrite

NO₂^-

Permanganate

MnO₄^-

Thiocyanate

SCN^-

Carbonate

CO₃²^-

Chromate

CrO₄²^-

Dichromate

Cr₂O₇²^-

Manganate

MnO₄²^-

Oxalate

C₂O₄²^-

Peroxide

O₂²^-

Sulfate

SO₄²^-

Sulfite

SO₃²^-

Tartrate

C₄H₄O₆²^-

Thiosulfate

S₂O₃²^-

Aluminate

AlO₃³^-

Arsenate

AsO₄³^-

Borate

BO₃³^-

Citrate

C₆H₅O₇³^-

Phosphate

PO₄³^-

Phosphite

PO₃³^-