The explanation for the presence of three unpaired electrons in the nitrogen atom is given by _____.

Pauli's exclusion principle

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Aufbau principle

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Hund's rule

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Heisenberg uncertainty principle

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Solution

The correct option is C Hund's rule
The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by Hund's rule.

According to this rule, electron pairing in any orbital (s, p, d or f) does not take place until each orbital of the a subshell contains one electron with paralell spin.

The electronic configuration of nitrogen is $1 s^{2} 2 s^{2} 2 p^{3}$

Thus, nitrogen contains three unpaired electrons following Hund's rule of maximum multiplicity.

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