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Question

কোনটি পরমাণুর সঠিক ইলেকট্রন বিন্যাস?

$[A r] 4 s^{1} 3 d^{6}$

$[A r] 4 s^{2} 3 d^{4}$

$[A r] 4 s^{2} 3 d^{9}$

$[A r] 4 s^{1} 3 d^{5}$

$[A r] 4 s^{0} 3 d^{6}$

ANSWER : 4

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