POLYATOMIC IONS
Charge
Ion
Name
Ion
Name
+1
NH
4
+
ammonium
-1
NO
3
-
nitrate
NO
2
-
nitrite
OH
-
hydroxide
C
2
H
3
O
2
-
acetate
HCO
3
-
hydrogen carbonate,
also called bicarbonate
CN
-
cyanide
Cl
O
4
-
perchlorate
Cl
O
3
-
chlorate
Cl
O
2
-
chlorite
Cl
O
-
hypochlorite
MnO
4
-
permanganate
HSO
4
-
hydrogen sulfate
H
2
PO
4
-
dihydrogen phosphate
SCN
-
thiocyanate
-2
SO
4
2-
sulfate
SO
3
2-
sulfite
CO
3
2-
carbonate
CrO
4
2-
chromate
Cr
2
O
7
2-
dichromate
O
2
2-
peroxide
C
2
O
4
2-
oxalate
HPO
4
2-
hydrogen phosphate
-3
PO
4
3-
phosphate
AsO
4
3-
arsenate
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