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Question

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

ইলেকট্রন বিন্যাসটি কোন মৌলের ?

Cr

Fe

Mn

Co

Cu

ANS : 3

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