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April 30, 1897
British physicist J. J. Thomson and his team announce the discovery of the electron.
J. J. Thomson
Sir Joseph John "J. J." Thomson was an English physicist whose study of cathode rays led to his discovery of the electron, a subatomic particle with a negative electric charge.
Electron
The electron is a subatomic particle with a negative one elementary electric charge. It is a fundamental particle that comprises the ordinary matter that makes up the universe, along with up and down quarks.