Polyatomic Ions

acetate

C₂H₃O₂ ^-

carbonate

CO₃ ^2-

hydrogen carbonate / bicarbonate

HCO₃ ^-

hydroxide

OH^-

nitrite

NO₂ ^-

nitrate

NO₃ ^-

chromate

CrO₄ ^2-

dichromate

Cr₂O₇ ^2-

phosphate

PO₄ ^3-

hydrogen phosphate

HPO₄ ^2-

dihydrogen phosphate

H₂PO₄ ^-

ammonium

NH₄ ⁺

hypochlorite

ClO^-

chlorite

ClO₂ ^-

chlorate

ClO₃ ^-

perchlorate

ClO₄ ^-

permanganate

MnO₄ ^-

sulfite

SO₃ ^2-

hydrogen sulfite / bisulfite

HSO₃ ^-

sulfate

SO₄ ^2-

hydrogen sulfate / bisulfate

HSO₄ ^-

cyanide

CN^-

peroxide

O₂ ^2-

iodide

I^-

hypoiodite

IO^-

iodite

IO₂ ^-

iodate

IO₃ ^-

periodate

IO₄ ^-

bromide

Br^-

hypobromite

BrO^-

bromite

BrO₂ ^-

bromate

BrO₃ ^-

perbromate

BrO₄ ^-