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The orbital diagram in which the Aufbau ...

The orbital diagram in which the Aufbau principle is violated is

A

a.

B

b.

C

c.

D

d.

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The correct Answer is:
B
Option (B) is wrong representation according to Aufbau principle. A high energy atomic orbital (2p) cannot be filled unless the low energy orbital (2s) is completely occupied. In case of option (A), Hund’s rule is violated.
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