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The orbital diagram in which the Aufbau...

The orbital diagram in which the Aufbau principle is violated is

A

B

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D

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The correct Answer is:
B
According to Aflau's principal filing of electron in verious subshells of an atom taken place in the increasing value of energy staring with the lower most .The following order is observed
`1s 2s 3s 3p 4s 3d 5s 4d 5p 6s 4f 5d 6p 7s……` Filing of `2p` orbital cannot start the dcompetion of the `2s` orbitals
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