Question

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

• A. Heisenberg's uncertainty principle
• B. Hund's rule
• C. Pauli's exclusion principle
• D. Aufbau Principle

Answer 1

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 $(s,p,d\text{or}f)$ cannot take place until each orbital of the same sub-level contains 1 electron each of like spin.