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একটি পরমাণুর Z = 31 । এর স্বাভাবিক ইলেকট্রন বিন্যাস হবে -

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4} 3 d^{8} 4 s^{2} 4 p^{3}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{1}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1} 4 p^{2}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} 4 s^{1} 4 p^{3}

ANS : 2

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