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Question

How many core electrons and valence electrons are present in 11Na?

A
10, 1
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B
4, 7
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C
2, 9
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D
7, 4
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Solution

The correct option is A 10, 1
Core electrons are the electrons which are in the completely filled shells. Basically the electrons present in the inner shell are core electrons.

Valence electrons are the electrons which are present in shells which are not completely filled. These electrons are added to the shell with highest principle quantum number (with exceptions) and has the highest energy level.

Electronic configuration of Na is 1s22s22p63s1

So, the number of core electrons are 10 as they have been completely filled shells.
Number of valence electrons = 1

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