Question

the incoming electron will occupy 3d first but not 4s. is it correct? why?​

Answer 1

Answer:

We say that the 4s orbitals have a lower energy than the 3d, and so the 4s orbitals are filled first. We know that the 4s electrons are lost first during ionization. The electrons lost first will come from the highest energy level, furthest from the influence of the nucleus.

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