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Lived 1856 - 1940. J. J. Thomson took science to new heights with his 1897 discovery of the electron - the first subatomic particle. He also found the first evidence that stable elements can exist as isotopes and invented one of the most powerful tools in analytical chemistry - the mass spectrometer. Advertisements Beginnings: School
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Facts -Thomson was born in 1856 and died in Thomson attended Owens college and Trinity college. - ppt download