Chemistry Polyatomic Ions

Formulas, names, and charge for common polyatomic ions

Acetate ion

C₂H₃O₂⁻

Chlorate ion

ClO₃⁻

Chlorite ion

ClO₂⁻

Cyanide ion

CN⁻

hydroxide ion

OH⁻

Hypochlorite ion

ClO⁻

Nitrate ion

NO₃⁻

Nitrite ion

NO₂⁻

Perchlorate ion

ClO₄⁻

Permangante Ion

MnO₄⁻

Thiocyanate ion

SCN⁻

Bicarbonate ion

HCO₃⁻

Bisulfate ion

HSO₄⁻

Dihydrogen phosphate ion

H₂PO₄⁻

Carbonate ion

CO₃²⁻

Chromate ion

CrO₄²⁻

Dichromate ion

Cr₂O₇²⁻

Sulfate ion

SO₄²⁻

Sulfite ion

SO₃²⁻

Monohydrogen phosphate ion

HPO₄²⁻

Arsenate ion

AsO₄³⁻

Phosphate ion

PO₄³⁻

Phosphite ion

PO₃³⁻

Ammonium ion

NH₄⁺

-ate and -ite

both have oxygen

-ide

no oxygen, single element

-ate

very common, building block

-ite

1 less oxygen than ate, same charge

hypo-

1 less oxygen than ite

per-

1 more oxygen than ate