Categories: Chemistry WAEC

“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:

Option A – Aufbau Principle

Explanation

– The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones

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