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Question

The principles that gives the correct explanation why ground state electronic configuration of Si is
and not
is:

A
Heisenberg's uncertainty principle
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B
Hund's rule
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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 B Hund's rule
The ground state electronic configuration of Si is:

This is in accordance with Hund's rule which states that electron pairing in any orbital (s,p,d or f) cannot take place until each orbital of the same sub-level contains 1 electron each of like spin.

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