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Question

নিম্নের কোন ইলেকট্রন বিন্যাসটি ভূমিস্তরের পরমাণুর (ground state atom) জন্য সঠিক নয়?

C a (20) [A r] A s^{2}

C r (24) [A r] 3 d^{4} 4 s^{2}

F e (26) [A r] 3 d^{6} 4 s^{2}

C u (29) [A r] 3 d^{10} 4 s^{1}

ANS : 2

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