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Q.

The element having the electronic configuration $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1} is$

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a

A transition element

b

A representative element

c

An inert gas

d

An inner transition element

answer is B.

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Detailed Solution

A representative element as last $e^{-}$ enters p-orbital.

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The element having the electronic configuration 1s2,2s2, 2p6,3s2,3p1 is