Proton Neutron Electron
Electron
Electron was discovered by J.J. Thomson. Cathode rays consist of small, negatively charged particles called electrons.
Proton
Proton was discovered by Goldstein. The proton is a positively charged particle found in the atoms of all the elements.
Neutron
In 1932, Chadwick discovered the fundamental particle neutron. The neutron is a neutral particle found in the nucleus of an atom.
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