List Of Common Polyatomic Ions

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List of Common Polyatomic Ions
NOTES
-ate
Ending for the
polyatomic ion with
most common number
most common number
of oxygen atoms
-ite
One less oxygen
than “ate”
per-
One additional oxygen
than “ate”
hypo-
One less oxygen than
“ite”
-ide
Althought the suffix is
reserved for the
monotomic anion,
exceptions include
cyanide, hydroxide,
and peroxide
di
Two or double (i.e., as
with dichromate,
double the numeric
subscripts on the
chromate ion and
reduce the oxygen by
d
th
b
one; retain charge)
bi
An H is present in a
polyatomic ion that
normally has a 2- or
greater charge
t
h
thio-
Add one sulfur in
place of an oxygen
Metals with more than one charge
Formula
Stock name
Classical name
Formula
Stock name
Classical name
+1
+1
+2
+2
C
Cu
C
Copper (I) ion
(I) i
C
Cuprous ion
i
H
Hg
M
Mercury (I) ion
(I) i
M
Mercurous ion
i
2
+2
+2
Cu
Copper (II) ion
Cupric ion
Hg
Mercury (II) ion
Mercuric ion
+2
+2
Fe
Iron (II) ion
Ferrous ion
Pb
Lead (II) ion
Plumbous ion
+3
+4
Fe
Iron (III) ion
Ferric ion
Pb
Lead (IV) ion
Plumbic ion
+2
+2
Sn
Tin (II) ion
Stannous ion
Cr
Chromium (II) ion
Chromous ion
+4
+3
Sn
Tin (IV) ion
Stannic ion
Cr
Chromium (III) ion
Chromic ion
+2
+2
Co
Cobalt (II) ion
Cobaltous ion
Mn
Manganese (II) ion
Manganous ion
+3
+3
Co
Cobalt (III) ion
Cobaltic ion
Mn
Manganese (III) ion
Manganic ion

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