Question

Why is 4s orbital filled before 3d orbital?

Answer 1

4s orbital have low energy compared to that of 3d orbital.So 4s orbital is filled first.

Answer 2

Explanation:

.The Aufbau principle states that after higher energy orbitals are filled, lower energy orbitals are filled first.

.The (n+l) rule can be used to calculate the orbital's energy.

.Since the 4s orbitals have a lower energy than the 3d orbitals, they are filled first, according to our theory.

.We are aware that during ionisation, the 4s electrons are lost first.

.The highest energy level electrons that are most far from the nucleus' influence are the ones that will lose their electrons first.

. Consequently, the 4s orbital must be more energetic than the 3d orbitals.

. Electrons from orbital 4s will be ionised first because it is the outermost orbital in this scenario.

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