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Z= 8, Z =25 এর ইলেকট্রন বিন্যাস হবে-

1 s^{2} 2 s^{2} 2 p^{2} 3 s^{1} (A r) 3 d^{5} 4 s^{1} 4 p^{1}

1 s^{2} 2 s^{2} 2 p^{3} 3 s^{2}, (A r) 3 d^{2} 4 s^{2} 4 p^{3}

1 s^{2} 2 s^{2} 2 p^{4} 3 s^{0}, (A r) 3 d^{5} 4 s^{2} 4 p^{0}

1 s^{2} 2 s^{1} 2 p^{4} 3 s^{1}, (A r) 3 d^{4} 3 s^{4} 4 p^{2}

ANS : 3

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