J. J. Thomson (18 dic 1856 año – 30 agos 1940 año)

Descripción:

1856-1940 AD in England

-Discovered the electron, the first ever known subatomic particle.
-Found the first evidence that stable elements can exist as isotopes.
-Invented the mass spectrometer.
-Created the incorrect plum pudding model of the atom, with electrons in a pudding of positive atom

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