Polyatomic Ions List 1


Polyatomic ions are ions that contain more than one element. This polyatomic ions list contains many common polyatomic ions grouped by charge. Each entry contains the ion’s name, molecular formula and chemical structure.

+1 Polyatomic Ions

 Ion FormulaStructure
AmmoniumNH4+Ammonium Cation Structure
HydroniumH3O+Hydronium Ion

-1 Polyatomic Ions

 Ion FormulaStructure
AcetateC2H3O2Acetate Anion
BicarbonateHCO3bicarbonate anion structure
BisulfateHSO4Bisulfate Anion Structure
ChlorateCO3Chlorate Anion Structure
ChloriteClO2Chlorite Anion Structure
CyanateOCNCyanate Anion
CyanideCNCyanide Anion Structure
Dihydrogen phosphateH2PO4Dihydrogen Phosphate Anion
Dihydrogen phosphiteH2PO3Dihydrogen Phosphite Anion
HydroxideOHHydroxide Anion
NitrateNO3Nitrate Anion
NitriteNO2Nitrite Anion
PerchlorateClO4Perchlorate Anion
PermanganateMnO4Permanganate Anion
ThiocyanateSCNThiocyanate Anion

-2 Polyatomic Ions

 Ion FormulaStructure
CarbonateCO32-Carbonate Anion
ChromateCrO42-Chromate Anion
DichromateCr2O72-Dichromate Anion
Hydrogen phosphateHPO42-Hydrogen Phosphate Anion
PeroxideO22-Peroxide Anion
SilicateSiO32-Silicate Anion
SulfateSO42-Sulfate Anion
SulfiteSO32-Sulfite Anion
ThiosulfateS2O32-Thiosulfate Anion

-3 Polyatomic Ions

 Ion FormulaStructure
PhosphatePO43-Phosphate Anion
PhosphitePO33-Phosphite Anion

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