What is the electron configuration for potassium?

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

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[A r] 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} 3 d^{5}

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

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Solution

The correct option is C $[A r] 4 s^{1}$
Potassium is forst element of period 4. Electronic configuration of potassium is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$ and also $[A r] 4 s^{1}$ where $[A r]$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$
option B is correct

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