What subatomic particle did J.J. Thomson discover?
Proton
Neutron
Electron
Photon
Answer
J.J. Thomson discovered the electron, the first subatomic particle to be discovered. This groundbreaking discovery was made in 1897 when Thomson showed that cathode rays were composed of previously unknown negatively charged particles, which he called electrons.
Unlocking the Secrets of the Atom: The J.J. Thomson Chronicles!