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Electrons were discovered by…

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Electrons were discovered by

  • A. Dalton
  • B. James Chadwick
  • C. J J Thompson
  • D. Neils Bohr




Sir J J Thompson discovered a stream of cathode rays in an experiment. After observing the characteristics of these cathode rays which include deflection in electric and magnetic fields, he found that they are in fact negatively charged streams of particles called electrons.

Now for the right answer to the above question:

  1. Option A is incorrect. Dalton only proposed some of the earliest atomic theories which have today been debunked.
  2. Option B is incorrect. James Chadwick discovered neutron and not electron.
  3. C is correct. J J Thompson discovered cathode rays, also known as electrons.
  4. D is not the correct answer. Neils Bohr used planks quantum theory to proposed the theory and structure of hydrogen atom.


You may please note these/this:

  • Sir J J Thompson even went ahead to use the measurements obtained from deflecting electrons to calculate charge to mass ratio.

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/ culled from 2019 JAMB-UTME physics question 11 /

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