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Question

Why is 3d orbital filled after 4s?


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Solution

Aufbau principle:

The Aufbau principle dictates the manner in which electrons are filled in the atomic orbitals of an atom in its ground state.

Since, the energy of 3d orbital is more than 4s orbital, on the basis of the Aufbau principle, it is filled after 4s orbital.

But during ionization, electrons in the outermost orbital are lost.

Since, 4s will be the outermost orbital, in this case, electrons from this orbital will be ionized first.


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