WAEC Chemistry 2019 Objective — Question 45
Question 45 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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The atoms 64/29Cu and 65/30Zn have the same number of
- A. protons
- B. electrons
- C. neutronsCorrect
- D. mass number
Explanation
For 64Cu: neutrons = 64 − 29 = 35. For 65Zn: neutrons = 65 − 30 = 35. Both isotopes therefore have the same number of neutrons (35).
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