Sir Joseph John "J. J." Thomson (18 December 1856 – 30 August 1940) was a British physicist and Nobel laureate. He is credited with discovering electrons and isotopes, and inventing the mass spectrometer. Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
Joseph John Thomson 1906 Born: 18 December 1856, Cheetham Hill, near Manchester, United Kingdom Died: 30 August 1940, Cambridge, United Kingdom Affiliation at the time of the award: University of Cambridge, Cambridge, United Kingdom Prize motivation: "in recognition of the great merits of his theoretical and experimental investigations on the conduction of electricity by gases" Field: Atomic physics
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"Sir Joseph Thomson (1856-1940), Cavendish Professor (1884-1919)" by Arthur Hacker
El 30 de abril de 1897, Joseph John Thomson (1856-1940) anunció el descubrimiento del electrón (aunque él no lo llamó así, lo llamó corpúsculo) en una conferencia impartida en la Royal Institution en Londres.