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Electrons were discovered by

  • A.J.J. Thomson
  • B.Roentgen
  • C.Edison
  • D.Rutherford

Answer: A

J.J. Thomson discovered the electron.

He showed in 1897 that cathode rays are particles far lighter than any atom, and identical whatever gas or electrode was used - so they must be a constituent of all matter. He won the Nobel Prize in 1906.

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