Question

In the following electronic configuration, some rules have been violated.

I: Hund's rule

II: Pauli's exclusion principle

III: Aufbau principle

• A. I and II
• B. I and III
• C. II and III
• D. I, II and III

Answer 1

The correct option is A I and II

Hund's rule and Pauli's exclusion principle are violated here.

Hund's rule: Every subshell must be filled in the same spin before pairing is done.

Pauli's principle: No $e^{-}$ can have the same set of all quantum numbers.