Question

Which rule explains the electronic configuration of chromium is [Ar] $3d^{5}4s^1$ instead of [Ar]$3d^{4}4s^2$?

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

Answer 1

The correct option is C Hund's rule

According to Hund's rule, first we fill single electron in every orbit of a subshell then we go for next ,here all the D orbit get filled by single electron that show it follow the Hund's rule.