Commcommon Polyatomic Ions Chart
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1Common Polyatomic Ions:
Names, Formulas and Charges of Polyatomic Ions
By
Anne Marie Helmenstine,
Ph.D., Guide
This is a list of some of the most common polyatomic ions. It is worth committing the polyatomic ions to
memory, including their molecular formulas and ionic charge.
Polyatomic Ion Charge = +1
+
ammonium - NH
4
Polyatomic Ion Charge = -1
-
acetate - C
H
O
2
3
2
-
bicarbonate (or hydrogen carbonate) - HCO
3
-
bisulfate (or hydrogen sulfate) - HSO
4
-
chlorate - ClO
3
-
chlorite - ClO
2
-
cyanate - OCN
-
cyanide - CN
-
dihydrogen phosphate - H
PO
2
4
-
hydroxide - OH
-
nitrate - NO
3
-
nitrite - NO
2
-
perchlorate - ClO
4
-
permanganate - MnO
4
-
thiocyanate - SCN
Polyatomic Ion Charge = -2
2-
carbonate - CO
3
2-
chromate - CrO
4
2-
dichromate - Cr
O
2
7
2-
hydrogen phosphate - HPO
4
2-
peroxide - O
2
2-
sulfate - SO
4
2-
sulfite - SO
3
2-
thiosulfate - S
O
2
3
Polyatomic Ion Charge = -3
3-
borate - BO
3
3-
phosphate - PO
4
(May 4, 2011)
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