WAEC Chemistry 2019 Objective — Question 49

Question 49 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The group to which elements belong in the periodic table is determined by the number of

A. electrons
B. core electrons
C. valence shells
D. valence electronsCorrect

Explanation

An element's group in the periodic table is determined by its number of valence (outermost shell) electrons; the period is determined by the number of shells.

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