... electron. B) He proved the existence of this entirely new particle to be more than 1000 times lighter than any known atom. C) "Corpuscles" which was called by Thomson, was later called "electron" as we know it today, by Stoney. The electron was discovered in 1897 by Joseph John Thomson, the Cavendish professor of Experimental Physics at Cambridge University and director of its Cavendish Laboratory from 1884 until 1919. It was discovered in the form of cathode rays, and was the first elementary particle to be identified. The electron is the lightest known particle which possesses an electric charge. The electron plays a fundamental role in every branch of pure and applied science, and its discovery marked a major advance in our understanding of nature. Joseph John Thomson was born on December 18, 1856 near Manchester, England. His father died when he was only sixteen. But at the early age of fourteen, Thomson ...

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