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Asked by Sahgalvarsha 24th November 2018, 6:44 PM
Answered by Expert
Discovery of Fundamental particles of an atom:
1)Discovery of the Electron
  • A British scientist J.J. Thomson was the first one to discover the electron in the year 1897.
  • J.J. Thomson performed an experiment to know the characteristics and constituents of the cathode rays.
  • From his experiment, Thomson arrived at the conclusion that, cathode rays are nothing but a stream of negatively charged particles.
  • These negatively charged particles are called as electrons.

2) Discovery of the Proton

  • A German scientist, E. Goldstein in 1886, modified the discharge tube and passed an electric current through it.
  • He found that the positively charged rays were emitted from the anode in the discharge tube. These rays were called canal rays.
  • These positively charged particles were named as protons by a British scientist, Ernest Rutherford.

3) Discovery of the Neutron

  • In 1932, James Chadwick observed that when beryllium was exposed to α-particles, different kinds of particles were emitted.
  • These particles had about the same mass as protons and carried no electrical charge.
  • Hence, Chadwick named this particle as the neutron.
Structure of an atom:

Answered by Expert 27th November 2018, 9:52 AM
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