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Question

Nitrogen atom has three unpaired electron because it follows:

A
Hund' s rule
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B
Heisenberg' s uncertainty principle
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C
Pauli' s exclusion principle
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D
Aufbau principle
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Solution

The correct option is A Hund' s rule
As per Hund’s rule, electron in a subshell cannot pair up unless each orbital is filled singly. Hence in nitrogen, unless each of the p orbitals are filled singly by electrons, electrons do not pair up as a result of which it has 3 unpaired electrons.

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