WAEC Chemistry 2024 Objective — Question 36
Question 36 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.
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36. The electron configuration of ₂₉Cu is
- A. 1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰Correct
- B. 1s²2s²2p⁶3s²3p⁶4s²3d⁹
- C. 1s²2s²2p⁶3s²3p⁶3d⁹4s²
- D. 1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹
Explanation
Copper adopts 4s¹3d¹⁰ rather than 4s²3d⁹ because the fully filled 3d subshell offers greater stability.
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