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Question

পর্যায় সারণীর ৪র্থ পিরিয়ডের HA গ্রুপে উপস্থিত মৌলটির ইলেকট্রন বিন্যাস হল-

None of the above

I s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}

I s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 4 s^{2} 3 d^{2}

I s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}

ANS : 4

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