Polyatomic Ions Chart
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1
2POLYATOMIC IONS
-2 Anions
+1 Cations
-2
Carbonate
CO
+1
Ammonium
NH
3
4
-2
Chromate
CrO
+1
Hydronium
H
0
4
3
-2
Dichromate
Cr
O
-1 Anions
2
7
-2
dibasic
HPO
-1
Acetate
C
H
O
4
2
3
2
phosphate
-1
Amide
NH
2
(Hydrogen
-1
Azide
N
3
phosphate)
-1
Benzoate
C
H
O
7
5
2
-2
Disulfate
S
O
-1
Bitartrate
HC
H
O
2
7
4
4
6
(Pyrosulfate)
-1
Bromate
BrO
3
-2
Manganate
MnO
-1
Bromite
BrO
4
2
-2
Metasilicate
SiO
-1
Chlorate
ClO
3
3
-2
Oxalate
C
O
-1
Chlorite
ClO
2
4
2
-2
Peroxide
O
-1
Cyanate
OCN
2
-2
Sulfate
SO
-1
Cyanide
CN
4
-2
Sulfite
SO
-1
Hydrazide
N
H
3
3
3
-2
Tartrate
C
H
O
-1
Hydrogen
HCO
4
4
6
3
-2
Tetraborate
B
O
carbonate
4
7
-2
Thiosulfate
S
O
(Bicarbonate)
2
3
-3 Anions
-1
Hydrogen
HSO
4
-3
Aluminate
AlO
sulfate
3
-3
Arsenate
AsO
(Bisulfate)
4
-3
Arsenite
AsO
-1
Hydrogen sulfite
HSO
3
3
-3
Borate
BO
(Bisulfite)
3
-3
-1
Citrate
C
H
O
Hydroxide
OH
6
5
7
-3
-1
Ferricyanide
Fe(CN)
Hypochlorite
ClO
6
-3
Phosphate
PO
-1
Iodate
I
O
4
3
-1
-3
Iodite
IO
Phosphite
PO
2
3
-1
-4 Anions
Nitrate
NO
3
-4
-1
Ferrocyanide
Fe(CN)
Nitrite
NO
6
2
-4
-1
Silicate (ortho)
SiO
Monobasic
H
PO
4
2
4
phosphate
(Dihydrogen
phosphate)
-1
Perchlorate
ClO
4
-1
Permanganate
MnO
4
-1
Thiocyanate
SCN
-1
Triiodide
I
3
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