Which one of the following particles in the nucleus of an atom was discovered by J. Chadwick?

  1. A. Electron
  2. B. Proton
  3. C. Positron
  4. D. Neutron

Correct Answer: D. Neutron

Explanation

James Chadwick discovered the neutron, a neutral subatomic particle present in the nucleus of an atom, in 1932.

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