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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7} 4 s^{2}

গ্রুপ VIII

গ্রুপ VII

গ্রুপ III

গ্রুপ II

ANS : 1

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