Common Polyatomic Ions

acetate

acetate

C₂H₃O₂⁻

ammonium

NH₄⁺

arsenate

AsO₄³⁻

borate

BO₃^3-

bromate

BrO₃^-

carbonate

CO₃^2-

chlorate

ClO₃^-

chromate

CrO₄²⁻

cyanide

CN⁻

dichromate

Cr₂O₇²⁻

dihydrogen phsophate

H₂PO₄⁻

hydrogen carbonate

HCO₃⁻

hydrogen phosphate

HPO₄^2-

hydrogen sulfate

HSO₄^-

hydrogen sulfite

HSO₃^-

hydronium

H₃O⁺

hydroxide

OH^-

hypochlorite

ClO^-

iodate

IO₃^-

nitrate

NO₃^-

nitrite

NO₂^-

oxalate

C₂O₂^2-

perchlorate

ClO₄^-

permanganate

MnO₄^-

peroxide

O₂^2-

phosphate

PO₄^3-

phosphite

PO₃^3-

silicate

SiO₃^2-

sulfate

SO₄^2-

sulfite

SO₃^2-

thiosulfate

S₂O₃^2-