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Unilorin Post-UTME Chemistry 2023 (Model questions) Question 7

Question 7

Atomic Structure

The principle that states that no two electrons in an atom can have the same set of four quantum numbers is

  1. A.Pauli Exclusion principle
  2. B.Hund's rule
  3. C.Aufbau principle
  4. D.Heisenberg Principle
Show the answer and explanation

Answer: A (Pauli Exclusion principle)

Explanation

The Pauli exclusion principle says no two electrons in an atom share all four quantum numbers, so an orbital holds at most two electrons of opposite spin.