why electorn enter into the 4 S orbital after filing 3 p orbital but not into the 3 d or orbital why
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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 ionisation. The electrons lost first will come from the highest energy level, furthest from the influence of the nucleus.
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