Which must represent an atom in an excited state?

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$1 s^{2} 2 s^{2} 2 p^{1}$

$1 s^{2} 2 s^{2} 2 p^{2}$

$1 s^{2} 2 s^{2} 2 p^{2} 3 s^{1}$

$1 s^{2} 2 s^{2} 2 p^{5}$

answer is C.

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Detailed Solution

An atom in an excited state represent $1 s^{2} 2 s^{2} 2 p^{2} 3 s^{1}$ .

It follows that a valence electron will be elevated to a higher energy level in an electron configuration that represents an atom in its excited state.

Hence, option C is correct.

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