The valence electronic configuration of an element is $[N e] 3 s^{1}$ . The element is :

argon

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sodium

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magnesium

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fluorine

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Solution

The correct option is A sodium

electronic configuration of Ne = $1 s^{2} 2 s^{2} 2 p^{6}$

Atomic number of $N a = 11$ and electronic configuration = $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ .

Thus option (B) is correct.

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