Polyatomic Ions

ammonium ion

NH₄⁺

acetate ion

C₂H₃O₂⁻

carbonate ion

CO₃²⁻

chlorate ion

ClO₃⁻

chlorite ion

ClO₂⁻

chromate ion

CrO₄²⁻

cyanide ion

CN⁻

hydroxide ion

OH⁻

hypochlorite ion

ClO⁻

nitrate ion

NO₃⁻

nitrite ion

NO₂⁻

oxalate ion

C₂O₄²⁻

perchlorate ion

ClO₄⁻

permanganate ion

MnO₄⁻

phosphate ion

PO₄³⁻

sulfate ion

SO₄²⁻

sulfite ion

SO₃²⁻

thiosulfate ion

S₂O₃²⁻

arsenate ion

AsO₄³⁻