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Aufbau Principle

If the electr...

Question

If the electronic configuration of oxygen atom is written as
it would violate :

A

Hund's rule

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B

Pauli's exclusion principle

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C

Both Hund's & Pauli's principles

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D

None of these

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Solution

The correct option is A Hund's rule
According to Hund's Rule, electrons are first singly filled in each orbital then pairing starts. But in the above case, electrons are paired in the 2p subshell in the first two orbitals and the third one is vacant. Hence, it violates Hund's Rule.

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Aufbau Principle

Standard XII Chemistry

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