Oxidation Number Exercise Page 2
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Oxidation Number Exercise
Rule 2 Fluorine has an oxidation number of -1.
Exercises - Give the oxidation number for the following atoms:
-
NaF
Na =
IF
I =
ClF
Cl =
3
2
2-
SF
S =
PF
P =
SF
S =
4
3
6
3-
3-
PF
P =
PF
P =
W
F
W =
5
6
2
9
OF
O =
NF
N =
F
F =
2
3
2
Rule 3
The metals of group 1 (old CAS IA) have an oxidation number of +1
The metals of group 2 (old CAS IIA) have an oxidation number of +2
Sc, Y and Al have an oxidation number of +3.
Exercises - Give the oxidation number for the following atoms:
Na
O
Na =
Na
O
O =
KO
O =
2
2
2
2
NaOH
Na =
ScH
H =
LiH
H =
3
CaC
C =
CaMgO
O =
MgH
H =
2
2
2
MgF
Mg =
RbO
O =
MgSF
S =
2
2
6
NaPF
P =
LiBF
B =
6
4
Rule 4
Hydrogen has an oxidation number of +1 when combined with elements on
the right side of the periodic chart (non-metals) and a -1 when combined with
elements on the left side of the periodic chart (metals).
Exercises - Give the oxidation number for the following atoms:
HCl
Cl =
HF
F =
(why) NaOH
O =
+
HI
I =
UH
U =
NH
N =
3
4
PH
P =
H
SF
S =
NH
N =
3
2
6
3
AsH
As =
ScH
Sc =
HPF
P =
3
3
4
+
-
H
O
O =
OH
O =
3
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