Which of the following electronic configuration represents for an excited atom?

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}

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1 s^{2} 2 s^{2} 2 p^{4}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}

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Solution

The correct option is B $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}$
$1 S^{2}$ $2 S^{2}$ $2 P^{6}$ $3 S^{2}$ $3 P^{6}$ $3 d^{1}$ this is electronic configuration for potassiumin excited state. $d$ electron should first go into $4 s$ but it is in excited state.

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