WAEC Chemistry 2024 Objective — Question 4

Question 4 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.

4. The electron configuration 1s²2s²2pₓ² contravenes the

A. Pauli's exclusion principle
B. Aufbau's principle
C. Octet rule
D. Hund's ruleCorrect

Explanation

Hund's rule states electrons fill degenerate orbitals singly before pairing; pairing electrons in one 2p orbital while others remain empty violates this rule.

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