WAEC Chemistry 2010 Objective — Question 3

Question 3 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

Which of the following elements exhibits the same chemical properties as the atom ³⁵₁₇X? An element with

A. A. atomic number 17Correct
B. B. atomic number 18
C. C. mass number 35
D. D. mass number 52

Explanation

The chemical properties of an element depend on the atomic number (proton number), not the mass number. An element with atomic number 17 will exhibit the same chemical properties as X (which has atomic number 17).

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