The orbital diagram in which the Aufbau principle is violated is

Options

A.
B.
C.
D.

Answer

B

Explanation

According to the Aufbau principal, in the ground state of atoms, the orbitals are filled in the order of their increasing energies. In iother words, electron first occupy the lowesr enegry orbital available for tham and enter into higher enegry orbitals only when the lower enegry orbitals are filled. In this orbital diagram, `2s` orbital must be full. Thus, the correct orbital diargam is as follows: