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While filling up of electrons in the atomic orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why ?

Answer»

Solution :Applying `( n+ L)` rule, 4S orbital has lower ENERGY than 3d orbital. Hence, 4s is filled first. After the ortibals are flled 4s goes BEYOND 3d, i.e., 4s is father from nucleus thant 3d. Hence, electron from 4s is REMOVED earlier than from 3d.


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