Common Polyatomic Ions

Chloride

Cl^-

Hypochlorite

ClO^-

Chlorite

ClO₂^-

Chlorate

ClO₃^-

Perchlorate

ClO₄^-

Nitrate

NO₃^-

Nitrite

NO₂^-

Nitride

N^3-

Azide

N₃^-

Amide (Azanide)

NH₂^-

Ammonia

NH₃

Ammonium

NH₄⁺

Hydroxide

OH^-

Oxide

O^2-

Peroxide

O₂^2-

Superoxide

O₂^-

Ozonide

O₃^-

Hydronium

H₃O⁺

Triiodide

I₃^-

Bromide

Br^-

Hypobromite

BrO^-

Bromite

BrO₂^-

Bromate

BrO₃^-

Perbromate

BrO₄^-

Sulfate

SO₄^2-

Sulfite

SO₃^2-

Sulfide

S^2-

Disulfide

S₂^2-

Disulfate (Pyrosulfate)

S₂O₇^2-

Thiosulfate

S₂O₃^2-

Peroxydisulfate

S₂O₈^2-

Persulfate

SO₅^2-

Thiocyanate

-SCN

Cyanate

-OCN

Cyanide

-CN

Metasilicate

SiO₃^2-

Orthosilicate

SiO₄^2-

Pyrosilicate

Si₂O₇^6-

Iodide

I^-

Hypoiodite

IO^-

Iodite

IO₂^-

Iodate

IO₃^-

Periodate

IO₄^-

Phosphate

PO₄^3-

Phosphite

PO₃^3-

Phosphide

P^3-

Diphosphate (Pyrophosphate)

P₂O₇^4-

Triphosphate

P₃O₁₀^5-

Chromate

CrO₄^2-

Dichromate

Cr₂O₇^2-

Carbonate

CO₃^2-

Percarbonate

CO₄^2-

Carbide

C₂^2-

Oxalate

C₂O₄^2-

Permanganate

MnO₄^-

Manganate

MnO₄^2-

Borate

BO₃^3-

Acetate

C₂H₃O₂^-

Acetate

CH₃COO^-

Formate

HCOO^-

Benzoate

C₇H₅O₂^-

Benzoate

C₆H₅COO^-

Lactate

C₃H₅O₃^-

Tartrate

C₄H₄O₆^2-

Citrate

C₆H₅O₇^3-

Phtalate

C₈H₄O₄^2-

Hydrogen Carbonate (Bicarbonate)

HCO₃^-

Hydrogen Sulfate (Bisulfate)

HSO₄^-

Hydrogen Sulfite (Bisulfite)

HSO₃^-

Hydrogen Sulfide

HS^-

Hydrogen Phosphate

HPO₄^2-

Dihydrogen Phosphate

H₂PO₄^-

Hydrogen Phosphite

HPO₃^2-

Dihydrogen Phosphite

H₂PO₃^-