Ananionis an ion which has a negative charge. This is a table listing commonanionsand their formulas.

Table of Common AnionsSimple AnionsFormula

HydrideH-

OxideO2-

FluorideF-

SulfideS2-

ChlorideCl-

NitrideN3-

BromideBr-

IodideI-

OxoanionsFormula

ArsenateAsO43-

PhosphatePO43-

ArseniteAsO33-

Hydrogen PhosphateHPO42-

Dihydrogen PhosphateH2PO4-

SulfateSO42-

NitrateNO3-

Hydrogen SulfateHSO4-

NitriteNO2-

ThiosulfateS2O32-

SulfiteSO32-

PerchlorateClO4-

IodateIO3-

ChlorateClO3-

BromateBrO3-

ChloriteClO2-

HypochloriteOCl-

HypobromiteOBr-

CarbonateCO32-

ChromateCrO42-

Hydrogen Carbonate or BicarbonateHCO3-

DichromateCr2O72-

Anions from Organic AcidsFormula

AcetateCH3COO-

FormateHCOO-

Other AnionsFormula

CyanideCN-

AmideNH2-

CyanateOCN-

PeroxideO22-

ThiocyanateSCN-

OxalateC2O42-

HydroxideOH-

PermanganateMnO4-