Sir J. J. Thomson
Personal Information
Born January 1, 1856
Died January 1, 1940 (84 years old)
Cheetham Hill, United Kingdom
Also known as: Thomson, J. J. (Joseph John), Sir, 1856-1940, Sir J. J. Thomson
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Joseph John "J. J." Thomson discovered the electron, for which he won the 1906 Nobel Prize in Physics. He invented the cathode ray tube and the mass spectrometer. He found the first evidence of nuclear isotopes, distinguishing Neon 20 from Neon 22.