Polyatomic Ions (bolded)

CH₃COO / C₂H₃O₂^-

acetate

ClO₃^-

chlorate

ClO₂^-

chlorite

CN^-

cyanide

H₂PO₄^-

dihydrogen phosphate

HCOO^-

formate

HCO₃^-

hydrogen carbonate (bicarbonate)

HSO₄^-

hydrogen sulfate (bisulfate)

OH^-

hydroxide (hydroxyl when aqueous)

ClO^-

hypochlorite

IO₃^-

Iodate

NO₃^-

nitrate

NO₂^-

nitrite

ClO₄^-

perchlorate

MnO₄^-

permanganate

SCN^-

thiocyanate

CO₃^2-

carbonate

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

HPO₄^2-

monohydrogen phosphate

C₂O₄^2-

oxalate

SO₄^2-

sulfate

SO₃^2-

sulfite

PO₃^3-

phosphite

PO₄^3-

phosphate

NH₄⁺

ammonium

H₃O⁺

hydronium