In 1885, Sir William Crookes carried out a series of investigations about the behavior of metals heated in a vacuum. The experiment of Crookes and others showed that a heated cathode produced a stream of radiation, which could cause gases at low pressure to glow and which, make other substances emit light too. The radiation emitted from the cathode was given the name 'Cathode rays'. These Cathode rays were actually particles that had a negative charged which were further named Electrons.
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