Question

Every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin. This belongs to :

• A. Heisenberg uncertainty principle
• B. Pauli exclusion principle
• C. Schrodinger wave equation
• D. Hund's rule
• E. Bohr model of the hydrogen atom

Answer 1

The correct option is D Hund's rule

Hund's rule: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.