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Question

Chemistry Question on subshell electronic configuration

Which is not in accordance to Aufbau principle?

A

B

C

D

Answer

Explanation

Solution

Aufbau principle states that in the ground state of an atom, the orbital with lower energy is filled up first before the filling of the orbitals with a higher energy commences. Increasing order of energy of various orbitals is 1s,2s,2p,3s,3p,4s,3d,4p,5s…1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s \dots etc.