WAEC Chemistry 2019 Objective — Question 1

Question 1 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The periodic table is an arrangement of elements according to their

A. oxidation number
B. atomic numberCorrect
C. mass number
D. number of neutrons

Explanation

The periodic table arranges elements according to increasing atomic number; the electron arrangement (K,L,M,N notation) then fixes each element's group and period.

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