MDCAT Chemistry MCQ #974

Which rule explains why electrons fill orbitals to maximize parallel spins?

MDCAT Chemistry MCQ #974

  1. Question 1

    Q1. Which rule explains why electrons fill orbitals to maximize parallel spins?

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

    Answer: Hund's rule

    Explanation: Hund's rule states electrons occupy orbitals singly first. Aufbau (B) governs filling order, not spin.