Electron as subatomic particle

Demonstrated that cathode rays are made of negatively charged particles which could be deflected by an electric field. This was the first discovery of a subatomic particle, smaller than an atom.
 Joseph John Thomson England 1897 Electron as subatomic particle

Demonstrated that cathode rays are made of negatively charged particles which could be deflected by an electric field. This was the first discovery of a subatomic particle, smaller than an atom.