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Standard X
Chemistry
Electronic Configuration
The number of...
Question
The number of valence electrons in an atom with electronic configuration
1
s
2
2
s
2
2
p
6
3
s
2
3
p
3
is:
A
2
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B
3
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C
5
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D
11
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Solution
The correct option is
C
5
Valence electrons are the electrons present in the outermost shell of an atom.
Here in the given configuration
1
s
2
2
s
2
2
p
6
3
s
2
3
p
3
, the 3rd shell is the outermost shell and it contains
5
electrons which are presnt in
3
s
2
3
p
3
.
Hence option
C
is correct.
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1
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