WAEC Chemistry 2025 Objective — Question 45

Question 45 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

In the periodic table, valence electrons are indicated by

A. group numberCorrect
B. shell number
C. period number
D. atomic mass

Explanation

In a neutral atom (except helium), the group number is equal to the number of valence electrons (NB: Helium has 2 electrons despite being in group 8).

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