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JAMB Chemistry 2005 Question 30

Question 30

Atomic Structure

The component of an atom that contributes least to its mass is the

  1. A.proton
  2. B.nucleus
  3. C.neutron
  4. D.electron
Show the answer and explanation

Answer: D (electron)

Explanation

Protons and neutrons each have a mass of about 1 a.m.u., while an electron's mass is only about 1/1840 a.m.u., so electrons add almost nothing to an atom's mass.