Electrons always occupy the lowest empty energy level is a statement of
CHEMISTRY
WAEC 2020
Electrons always occupy the lowest empty energy level is a statement of
- A. Aufbau Principle
- B. Hund's rule
- C. Pauli Exclusion Principle
- D. Periodic law
Correct Answer: A. Aufbau Principle
Explanation
The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones
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