MDCAT Chemistry MCQ #886

Which principle states that electrons fill orbitals of equal energy singly before pairing?

MDCAT Chemistry MCQ #886

  1. Question 1

    Q1. Which principle states that electrons fill orbitals of equal energy singly before pairing?

    • A) Hund's Rule
    • B) Pauli Exclusion
    • C) Aufbau Principle
    • D) Heisenberg Uncertainty

    Answer: Hund's Rule

    Explanation: Hund's Rule maximizes unpaired electrons. Pauli limits two electrons per orbital.