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

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

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

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

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

ANS : 2

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