List Of Common Polyatomic Ions
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1List of Common Polyatomic Ions:
Cations:
Symbol
Name
Charge
Symbol
Name
Charge
+
+2
NH
Ammonium
+1
Hg
Dimercury (I)
+2
4
2
Anions:
Symbol
Name
Charge
Symbol
Name
Charge
-
2-
C
H
O
Acetate
-1
CO
Carbonate
-2
2
3
2
3
-
2-
C
H
COO
Benzoate
-1
CrO
Chromate
-2
6
5
4
-
2-
HCO
Bicarbonate
-1
Cr
O
Dichromate
-2
3
2
7
-
2-
HSO
Bisulfate
-1
HPO
Hydrogen Phosphate -2
4
4
-
2-
HSO
Bisulfite
-1
MoO
Molybdate
-2
3
4
-
2-
BrO
Bromate
-1
C
O
Oxalate
-2
3
2
4
-
2-
ClO
Chlorate
-1
O
Peroxide
-2
3
2
-
2-
ClO
Chlorite
-1
SiO
Silicate
-2
2
3
-
2-
CN
Cyanide
-1
SO
Sulfate
-2
4
-
2-
H
PO
Dihydrogen Phosphate -1
SO
Sulfite
-2
2
4
3
-
2-
OH
Hydroxide
-1
S
O
Thiosulfate
-2
2
3
-
2-
ClO
Hypochlorite
-1
WO
Tungstate
-2
4
-
3-
IO
Iodate
-1
AsO
Arsenate
-3
3
4
-
3-
NO
Nitrate
-1
AsO
Arsenite
-3
3
3
-
3-
NO
Nitrite
-1
BO
Borate
-3
2
3
-
3-
ClO
Perchlorate
-1
PO
Phosphate
-3
4
4
-
3-
IO
Periodate
-1
PO
Phosphite
-3
4
3
-
MnO
Permanganate
-1
4
Diatomic Molecules:
-
SCN
Thiocyanate
-1
3-
Fe(CN)
Hexacyanoferrate (III)
-3
Bromine
Br
6
2
4-
Fe(CN)
Hexacyanoferrate (II)
-4
Chlorine
Cl
6
2
Fluorine
F
2
Hydrogen
H
2
Variable Valence Cations:
Iodine
I
2
Antimony (III) and (V)
Nitrogen
N
2
Arsenic (III) and (V)
Oxygen
O
2
Cobalt (II) and (III)
Chromium (II), (III), and (VI)
Copper (I) and (II)
Prefixes (for non-metals):
Gold (I) and (III)
1 – Mono
Indium (I) and (III)
2 – Di
Iron (II) and (III)
3 – Tri
Lead (II) and (IV)
4 – Tetra
Manganese (II), (III), (IV), and (VIII)
5 – Penta
2+
Mercury (II) Hg
6 – Hexa
2+
Mercury (I)
Hg
2
7 – Hepta
Platinum (II) and (IV)
8 – Octa
Tin (II) and (IV)
9 – Nona
✤Silver (1+)
10 – Deca
✤Zinc
(2+)
✤Cadmium
Roman Numerals:
(2+)
✤Forms only one type of ion and
I One
IV Four
VII Seven
X Ten
Roman numerals are not used.
II Two
V Five
VIII Eight
III Three VI Six
IX Nine
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