Question

explain why electrons enters in 4s orbital but not 3d after filling the 3p orbital​

Answer 1

Answer:

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this is your answer.......

Because according to Aufbau's principle,electrons get filled in the increasing level of energy of the orbitals,after 3p, among 4s(n+l=4) and 3d(n+l=5) energy of 4s is lower due to lower (n+l) value, therefore electrons tend to fill in the 4s orbital first.

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Answer 2

Answer:

it's because of energy levels.