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Question

The number of valence electrons in an atom with electronic configuration 1s22s22p63s23p3 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 1s22s22p63s23p3, the 3rd shell is the outermost shell and it contains 5 electrons which are presnt in 3s23p3.
Hence option C is correct.

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