Polyatomic Ions

C₂H₃O₂^1- or CH₃COO^1-

acetate

C₂O₄^2-

oxalate

PO₄^3-

phosphate

SO₄^2-

sulfate

CO₃^2-

carbonate

HCO₃^1-

bicarbonate or hydrogen carbonate

MnO₄^1-

permaganate

OH^1-

hydroxide

O₂^2-

peroxide

NH₄¹⁺

ammonium

CN^1-

cyanide

OCN^1-

cyanate

SCN^1-

thiocyanate

ClO^1-

hypochlorite

ClO₂^1-

chlorite

ClO₃^1-

chlorate

ClO₄^1-

perchlorate

NO₂^1-

nitrite

NO₃^1-

nitrate

CH₃NH₃¹⁺

methylammonium

Ag¹⁺

silver

Cd²⁺

Cadmium

Zn²⁺

Zinc

Hg₂²⁺

Mercury (I)