Common Polyatomic Ions Chart
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1Common Polyatomic ions
1- charge
2- charge
3- charge
Formula
Name
Formula
Name
Formula
Name
-
2-
3-
H
PO
Dihydrogen phosphate
HPO
Hydrogen phosphate
PO
Phosphate
2
4
4
4
-
2-
3-
C
H
O
Acetate
C
O
Oxalate
PO
Phosphite
2
3
2
2
4
3
-
2-
HSO
Hydrogen sulfite
SO
Sulfite
3
3
-
2-
HSO
Hydrogen sulfate
SO
Sulfate
4
4
-
2-
HCO
Hydrogen carbonate
CO
Carbonate
3
3
-
2-
NO
Nitrite
CrO
Chromate
2
4
-
2-
NO
Nitrate
Cr
O
Dichromate
3
2
7
-
2-
CN
Cyanide
SiO
Silicate
3
-
OH
Hydroxide
-
MnO
Permanganate
1 + charge
4
-
ClO
Hypochlorite
-
ClO
Chlorite
2
Formula
Name
-
ClO
Chlorate
3
-
ClO
Perchlorate
+
4
NH
Ammonium
4
Formulas and Names of Common Metal Ions
with More than One Ionic Charge.
Formula
Stock Name
Classical Name
1+
Cu
Copper(I)ion
Cuprous ion
Prefixes Used in Naming
2+
Cu
Copper(II)ion
Cupric ion
Binary Molecular Compounds
2+
Fe
Iron(II)ion
Ferrous ion
3+
Fe
Iron(III)ion
Ferric ion
2+
Prefix
Number
diatomic
Hg
Mercury(I)ion*
Mercurous ion
2
2+
Hg
Mercury(II)ion
Mercuric ion
2+
Pb
Lead(II)ion
Plumbous ion
4+
Pb
Lead(IV)ion
Plumbic ion
Mono-
1
2+
Sn
Tin(II)ion
Stannous ion
4+
Sn
Tin(IV)ion
Stannic ion
Di-
2
2+
Cr
Chromium(II)ion
Chromous ion
Tri-
3
3+
Cr
Chromium(III)ion
Chromic ion
2+
Mn
Manganese(II)ion
Manganous ion
Tetra-
4
3+
Mn
Manganese(III)ion
Manganic ion
Penta-
5
2+
Co
Cobalt(II)ion
Cobaltous ion
3+
Co
Cobalt(III)ion
Cobaltic ion
Hexa-
6
Hepta-
7
Octa-
8
Nona-
9
Deca-
10
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