WAEC Chemistry 2015 Objective — Question 15
Question 15 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
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To which group and period respectively does an element with 15 electrons belong?
- A. 3 and 3
- B. 3 and 5
- C. 5 and 3Correct
- D. 5 and 5
Explanation
An atom with 15 electrons has configuration 2,8,5, giving group 5 (5 valence electrons) and period 3 (3 shells).
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