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JAMB Chemistry 1987 Question 8

Question 8

Atomic Structure

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?

  1. A.Neutrons 53, Protons 17
  2. B.Neutrons 17, Protons 36
  3. C.Neutrons 19, Protons 17
  4. D.Neutrons 36, Protons 17
Show the answer and explanation

Answer: C (Neutrons 19, Protons 17)

Explanation

Protons = atomic number = 17. Neutrons = mass number − atomic number = 36 − 17 = 19.