Which of the following is the CORRECT electron configuration for the potassium ion $(K^{+ 1})$ ?

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

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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^{6}

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

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Solution

The correct option is C $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$
The electronic configuration of K is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$ . To form $K^{+ 1}$ we remove electron. Thus the electrons configuration of $K^{+ 1}$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ . Hence answer is option C

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