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Ar পরমাণুর ইলেকট্রন বিন্যাস-

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

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1}

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

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

ANS : 3

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