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JAMB Chemistry 2002 Question 43

Question 43

Atomic Structure

Which of the following statements is true of a proton?

  1. A.The mass of a proton is 1840 times the mass of an electron
  2. B.The total mass of the protons in a particular nucleus is always half the nuclear mass.
  3. C.The mass of a proton is one-twelfth the molar mass of carbon
  4. D.The mass of a proton is 1.0008g.
Show the answer and explanation

Answer: A (The mass of a proton is 1840 times the mass of an electron)

Explanation

A proton's mass is about 1836 (roughly 1840) times that of an electron. One proton weighs only about 1.67 × 10−24 g; it is a mole of protons that weighs about 1 g.