WAEC Chemistry 2018 Objective — Question 19
Question 19 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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The valence electrons of ₁₂Mg are in the
- A. 3s orbitalCorrect
- B. 0.2Px orbital
- C. 2s orbital
- D. 1s orbital
Explanation
Magnesium (Z=12): 1s²2s²2p⁶6 3s². Its valence electrons occupy the 3s orbital.
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