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JAMB Chemistry 2021 Question 26

Question 26

Atomic Structure

An isotope X has atomic number of 17 and a mass number of 36. What is the number of neutrons and protons in the isotope X?

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

Answer: A (19 neutrons, 17 protons)

Explanation

Protons = atomic number = 17; neutrons = mass number − atomic number = 36 − 17 = 19.