WAEC Chemistry 2014 Objective — Question 4

Question 4 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.

The two elements ₁₁X and ₁₉Y are in the same group because they have

A. the same valence electronsCorrect
B. the same ionization energy
C. the same number of shell
D. the same atomic size

Explanation

The two elements are in the same group because they have equal numbers of electrons in their outermost shell — i.e., they both have one valence electron.

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