J.J.Thomson discovered that cathode rays were really a stream of electrons.

Name: J.J.Thomson discovered that cathode rays were really a stream of electrons.
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J.J.Thomson's experiments with cathode rays led to the discovery that these rays were comprised of negatively charged particles, which he called electrons. This discovery provided evidence for the existence of subatomic particles and helped set the stage for later discoveries in atomic physics.

JJThomson Discovered That Cathode Rays Were Really a Stream of Electrons