Common Polyatomic Ions Chart

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Common Polyatomic Ions
3
acetate
C
H
O
AsO
arsenite
2
3
2
3
+
3
ammonium
NH
AsO
arsenate
4
4
3
3
arsenate
AsO
BO
borate
4
3
3
arsenite
AsO
BrO
bromate
3
3
azide
N
C
H
O
acetate
3
2
3
2
2
benzoate
C
H
O
C
O
oxalate
7
5
2
2
4
3
2
borate
BO
C
H
O
⎯ tartrate
3
4
4
6
bromate
BrO
C
H
O
benzoate
3
7
5
2
2
carbonate
CO
ClO ⎯
hypochlorite
3
chlorate
ClO
ClO
chlorite
3
2
chlorite
ClO
ClO
chlorate
2
3
2
chromate
CrO
ClO
perchlorate
4
4
cyanide
CN ⎯
CN ⎯
cyanide
2
2
dichromate
Cr
O
CO
carbonate
2
7
3
2
dihydrogen phosphate H
PO
Cr
O
dichromate
2
4
2
7
2
dihydrogen phosphite H
PO
CrO
chromate
2
3
4
hydrogen carbonate
HCO
H
PO
dihydrogen phosphite
3
2
3
2
hydrogen phosphate
HPO
H
PO
dihydrogen phosphate
4
2
4
2
hydrogen phosphite
HPO
HCO
hydrogen carbonate
3
3
2
hydrogen sulfate
HSO
HPO
hydrogen phosphite
4
3
2
hydrogen sulfide
HS ⎯
HPO
hydrogen phosphate
4
hydrogen sulfite
HSO
HS ⎯
hydrogen sulfide
3
hydroxide
OH ⎯
HSO
hydrogen sulfite
3
hypochlorite
ClO ⎯
HSO
hydrogen sulfate
4
iodate
IO
IO
iodate
3
3
2
manganate
MnO
MnO
permanganate
4
4
2
nitrate
NO
MnO
manganate
3
4
nitrite
NO
N
azide
2
3
2
+
oxalate
C
O
NH
ammonium
2
4
4
perchlorate
ClO
NO
nitrite
4
2
permanganate
MnO
NO
nitrate
4
3
2
2
peroxide
O
O
peroxide
2
2
3
phosphate
PO
OH ⎯
hydroxide
4
3
3
phosphite
PO
PO
phosphite
3
3
2
3
silicate
SiO
PO
phosphate
3
4
2
2
sulfate
SO
S
O
thiosulfate
4
2
3
2
sulfite
SO
SCN ⎯
thiocyanate
3
2
2
tartrate
C
H
O
SiO
silicate
4
4
6
3
2
thiocyanate
SCN ⎯
SO
sulfite
3
2
2
thiosulfate
S
O
SO
sulfate
2
3
4

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