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F e^{2 +}

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

1 s^{1} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}

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

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

ANS : 1

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