Chemical Ions and Polyatomic Anions: Definitions and Formulas

Ammonium

(NH4)+

Peroxide

(O2)2-

Hydroxide

(OH)-

Hypochlorite

(ClO)-

Chlorite

(ClO2)-

Chlorate

(ClO3)-

Perchlorate

(ClO4)-

Hypobromite

(BrO)-

Bromite

(BrO2)-

Bromate

(BrO3)-

Perbromate

(BrO4)-

Hypoiodite

(IO)-

Iodite

(IO2)-

Iodate

(IO3)-

Periodate

(IO4)-

Sulfite

(SO3)2-

Sulfate

(SO4)2-

Bisulfite (hydrogen sulfate)

(HSO3)-

Bisulfate

(HSO4)-

Bisulfide

(HS)-

Thiosulfate

(S2O3)2-

Nitrite

(NO2)-

Nitrate

(NO3)-

Phosphite

(PO3)3-

Phosphate

(PO4)3-

Monohydrogen phosphate

(HPO4)2-

Dihydrogen phosphate

(H2PO4)-

Arsenate

(AsO4)3-

Carbonate

(CO3)2-

Bicarbonate (hydrogen carbonate)

(HCO3)-

Cyanide

(CN)-

Thiocyanate

(SCN)-

Cyanate

(OCN)-

Chromate

(CrO4)2-

Dichromate

(Cr2O7)2-

Permanganate

(Mn04)-

Acetate

(C2H3O2)- or (CH3COO)- or (CH3CO2)- or (OAc-)

Oxalate

(C2O4)2-

Borate

(BO3)3-