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The above configuration violates

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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

answer is D.

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Detailed Solution

‘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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