polyatomic ions

ammonium

ammonium

NH₄⁺¹

acetate

C₂H₃O₂⁻¹

hydroxide

OH⁻¹

cyanide

CN⁻¹

bromate

BrO₃⁻¹

iodate

IO₃⁻¹

nitrate

NO₃⁻¹

nitrite

NO₂⁻¹

perchlorate

ClO₄⁻¹

chlorate

ClO₃⁻¹

chlorite

ClO₂⁻¹

hypochlorite

ClO⁻¹

permanganate

MnO₄⁻¹

sulfate

SO₄⁻²

sulfite

SO₃⁻²

carbonate

CO₃⁻²

peroxide

O₂⁻²

chromate

CrO₄⁻²

dichromate

Cr₂O₇⁻²

oxalate

C₂O₄⁻²

arsenate

AsO₄⁻³

phosphate

PO₄⁻³

bicarbonate

HCO₃⁻¹

mercury I (dimercury)

Hg₂⁺²