WAEC Chemistry 2018 Objective — Question 45
Question 45 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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The atomic number of an isotope of hydrogen is equal to its mass number. This isotope is
- A. ¹H (protium)Correct
- B. ²H (deuterium)
- C. ³H (tritium)
- D. none of these
Explanation
Protium (¹₁H), the most common isotope of hydrogen, has 1 proton and 0 neutrons, so its atomic number equals its mass number (both = 1).
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