Question

Between 4s and 3d orbital which has lower energy
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Answer 1

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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Answer 2

Answer:

3d has lower energy and 4s has highest energy because 4S behaves as the outermost cell SO.

Explanation:

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