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Common Polyatomic Ions
(Alphabetical order by ion name) NOTE: -ite ending means one less oxygen than the -ate form.
PREFIXES:
per- = one more oxygen than -ate hypo- = one less oxygen than –ite
Ion Name Ion Symbol Ion Name^
Ion Symbol Ion Name^
Ion Symbol Ion Name^
Ion Symbol
Acetate
CH 3 CO 2 -
or CH 3 COO-
Dichromate Cr 2 O 7 2-^ Hypobromite BrO-^ Perrhenate ReO 4 -
Ammonium NH 4 +^ Dihydrogen Phosphate H^2 PO^4
- (^) Hypochlorite ClO- (^) Phosphate PO 4 3-
Arsenate AsO 4 3-^ Dihydrogen Phosphite H 2 PO 3 -^ Hypoiodite IO-^ Phosphite PO 3 3-
Arsenite AsO 3 3-^ Dithionate S 2 O 6 2-^ Iodate IO 3 -^ Plumbate PbO 3 2- Azide N 3 -^ Dithionite S 2 O 4 2-^ Iodite IO 2 -^ Plumbite PbO 2 2- Borate BO 3 2-^ Ferricyanide Fe(CN) 6 3-^ Isocyanate NCO-^ Rhenate ReO 4 2- Bromate BrO 3 -^ Ferrocyanide Fe(CN) 6 4-^ Manganate MnO 4 2-^ Selenate SeO 4 2- Bromite BrO 2 -^ Fulminate CNO -^ Nitrate NO 3 -^ Selenite SeO 3 2- Carbonate CO 3 2-^ Hydrazide N 2 H 3 -^ Nitrite NO 2 -^ Silicate SiO 3 2-
Chlorate ClO 3 -^ Hydrogen arsenate HAsO^4
2- (^) Oxalate C 2 O 4 2- (^) Stannate SnO 3 2-
Chlorite ClO 2 -^ Hydrogen carbonate HCO 3 -^ Ozonide O 3 -^ Stannite SnO 2 2-
Chromate CrO 4 2-^ Hydrogen Phosphate HPO 4 2-^ Perbromate BrO 4 -^ Sulfate SO 4 2-
Chromite CrO 2 -^ Hydrogen Phosphite HPO 3 2-^ Perchlorate ClO 4 -^ Sulfite SO 3 2-
Citrate C 6 H 5 O 7 3-^ Hydrogen Sulfate HSO 4 -^ Periodate IO 4 -^ Superoxide O 2 -
Cyanate OCN -^ Hydrogen Sulfite HSO^3
- (^) Permanganate MnO 4 - (^) Thiocyanate SCN -
Cyanide CN -^ Hydroxide OH-^ Peroxide O 2 2-^ Thiosulfate S 2 O 3 2-
Tungstate WO 4 2-
Common Polyatomic Ions
(Alphabetical order by formula)
NOTE: -ite ending means one less oxygen than the -ate form.
PREFIXES: per- = one more oxygen than -ate hypo- = one less oxygen than -ite
Ion Symbol
Ion Name
Ion Symbol Ion Name Ion Symbol Ion Name Ion Symbol Ion Name
AsO 3 3-^ Arsenite C 2 O 4 2-^ Oxalate IO 3 -^ Iodate PO 3 3-^ Phosphite AsO 4 3-^ Arsenate CrO 2 -^ Chromite IO 4 -^ Periodate PO 4 3-^ Phosphate BO 3 2-^ Borate CrO 4 2-^ Chromate MnO 4 2-^ Manganate PbO 2 2-^ Plumbite BrO-^ Hypobromite Cr 2 O 7 2-^ Dichromate MnO 4 -^ Permanganate PbO 3 2-^ Plumbate BrO 2 -^ Bromite Fe(CN) 6 3-^ Ferricyanide N 3 -^ Azide ReO 4 2-^ Rhenate BrO 3 -^ Bromate Fe(CN) 6 4-^ Ferrocyanide NCO-^ Isocyanate SCN-^ Thiocyanate
BrO 4 -^ Perbromate HAsO 4 2-^ Hydrogen arsenate NH 2 -^ Amide SO 3 2-^ Sulfite
CH 3 CO 2 - or CH 3 COO-
Acetate HCO 3 -^ Hydrogen carbonate NH 4 +^ Ammonium SO 4 2-^ Sulfate
C 6 H 5 O 7 3-^ Citrate HPO 3 2-^ Hydrogen Phosphite N 2 H 3 -^ Hydrazide S 2 O 3 2-^ Thiosulfate
ClO-^ Hypochlorite HPO 4 2-^ Hydrogen Phosphate NO 2 -^ Nitrite S 2 O 4 2-^ Dithionite
ClO 2 -^ Chlorite H 2 PO 3 -^ Dihydrogen Phosphite NO 3 -^ Nitrate S 2 O 6 2-^ Dithionate
ClO 3 -^ Chlorate H 2 PO 4 2-^ Dihydrogen Phosphate O^2
- (^) Superoxide SeO 3 2- (^) Selenite
ClO 4 -^ Perchlorate HSO 3 -^ Hydrogen Sulfite O 2 2-^ Peroxide SeO 4 2-^ Selenate
CN -^ Cyanide HSO 4 -^ Hydrogen Sulfate O 3 -^ Ozonide SiO 3 2-^ Silicate
CNO-^ Fulminate IO-^ Hypoiodite OCN -^ Cyanate SnO 2 2-^ Stannite CO 3 2-^ Carbonate IO 2 -^ Iodite OH-^ Hydroxide SnO 3 2-^ Stannate WO 4 2-^ Tungstate
