CHE 2A Ch2 Key Polyatomic Ions

Polyatomic Ions Terms to memorize

NH₄⁺

ammonium

O₂^2-

peroxide

OH^-

hydroxide

C₂H₃O₂^-

acetate

CN^-

cyanide

CO₃^2-

carbonate

HCO₃^-

bicarbonate 

NO₃^-

nitrate

NO₂^-

nitrite

SO₄^2-

sulfate

SO₃^2-

sulfite

HSO₄^-

hydrogen sulfate

H₃O⁺

hydronium

HSO₃^-

hydrogen sulfite

PO₄^3-

phosphate

HPO₄^2-

hydrogen phosphate

H₂PO₄^-

dihydrogen phosphate

ClO₄^-

perchlorate

ClO₃^-

chlorate

ClO₂^-

chlorite

ClO^-

hypochlorite

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

MnO₄^-

permanganate

C₂O₄^2-

oxalate

S₂O₃^2-

thiosulfate

N₃^-

azide

XO^-

hypohalite ion

XO₂^-

halite ion

XO₃^-

halate ion

XO₄^-

perhalate ion

MnO₄^-

Permanganate

C₂O₄^2-

oxalate

S₂O₃^2-

thiosulfate

HCO₃^-

hydrogen carbonate