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Question

The preference of three unpaired electrons in the ground state of phosphorous can be explained by:

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

The correct option is D Hund's rule
According to Hund's rule of maximum multiplicity, electron pairing does not occur until each degenerate orbital has one electron each.
In Phosphorus, atomic number = 15
So. electronic configuration = 1s2 2s2 2p6 3s2 3p1x 3p1y 3p1z

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