Why is it so that while filling electrons we fill first from 4s then to 3d but when taking out electrons we first take out from 4s then from 3d ...???
if there is matter of energy difference then why that energy difference occur..???
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Why is it so that while filling electrons we fill first from 4s then to 3d but when taking out electrons we first take out from 4s then from 3d ...???
if there is matter of energy difference then why that energy difference occur..???
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