Common Polyatomic Ions Chart
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1Common Polyatomic
Practice on-screen or print. You may want to cross out ions not required by your instructor.
Name
Formula/Charge
-
*
C
H
O
Acetate
2
3
2
+
Ammonium
NH
4
2-
Carbonate
CO
3
-
Chlorate
ClO
3
-
Chlorite
ClO
2
2-
Chromate
CrO
4
-
Cyanide
CN
2-
Dichromate
Cr
O
2
7
-
Dihydrogen Phosphate
H
PO
2
4
-
Hydrogen Carbonate
(Bicarbonate)
HCO
3
2-
Hydrogen Phosphate
HPO
4
-
Hydrogen Sulfate
(Bisulfate)
HSO
4
-
Hydrogen Sulfite
(Bisulfite)
HSO
3
+
Hydronium
H
O
3
-
Hydroxide
OH
-
Hypochlorite
ClO
-
Nitrate
NO
3
-
Nitrite
NO
2
2-
*
C
O
Oxalate
2
4
-
Perchlorate
ClO
4
-
Permanganate
MnO
4
3-
Phosphate
PO
4
3-
Phosphite
PO
3
2-
Sulfate
SO
4
2-
Sulfite
SO
3
2-
Thiosulfate
S
O
2
3
* Organic
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