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The above configuration violates

Hund's rule only
Aufbau's principle and and Hund's rule only
Aufbau's principle and Pauli's exclusion principle only
Hund's rule, Aufbau's principle and Pauli's exclusion principle

detailed solution

Correct option is D

‘1s’ orbital has two electrons with same spin.Thus Pauli's principle is violated.Electrons entered into higher 2p orbitals before completely filling 2s orbital.Thus Aufbau's principle is violated.The two unpaired electrons in degenerate orbitals of 2p subshell have opposite spin.Thus Hund's rule is violated.

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Consider the following electronic configuration 

this configuration violates

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