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C l (17)

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

1 s^{2} 2 s^{2} 2 p^{4} 3 s^{4} 3 p^{5}

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

1 s^{2} 2 s^{2} 2 p^{5} 3 s^{4} 3 p^{4}

ANS : 1

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