WAEC Chemistry 2010 Objective — Question 8
Question 8 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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Calcium and magnesium belong to the same group in the periodic table because both
- A. A. are metals
- B. B. form cations
- C. C. form colourless salts
- D. D. have the same number of valence electronsCorrect
Explanation
Elements that have equal valence electron(s) belong to the same group in the periodic table. Mg=2,8,2; Ca=2,8,8,2. Since they both have two valence electrons, they belong to group (II).
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