Common polyatomic ions

gen chem 1

ammonium

NH₄⁺

hydronium

H₃O⁺

mercury (i)

Hg₂²⁺

acetate

C₂H₃O₂^-

azide

N₃^-

carbonate

CO₃^-

chlorate

ClO₃^-

chlorite

ClO₂^-

chromate

CrO₄^2-

cyanide

CN^-

dichromate

Cr₂O₇^2-

dihydrogen phosphate

H₂PO₄^-

hydrogen carbonate (bicarbonate)

HCO₃^-

hydrogen phosphate

HPO₄^2-

hydrogen sulfate (bisulfate)

HSO₄^-

hydroxide

OH^-

hypochlorite

ClO^-

nitrate

NO₃^-

nitrite

NO₂^-

oxalate

C₂O₄^2-

perchlorate

ClO₄^-

permanganate

MnO₄^-

peroxide

O₂^2-

phosphate

PO₄^3-

phosphite

PO₃^3-

sulfate

SO₄^2-

sulfite

SO₃^2-

thiocyanate

SCN^-