Question

which particle is j. j. thomson credited with discovering?
○ electron
○ neutron
○ proton
○ photon

Explanation:

J. J. Thomson is known for discovering the electron through his cathode ray tube experiments. The neutron was discovered by James Chadwick, the proton's discovery is associated with Ernest Rutherford's work, and the photon is related to Albert Einstein's explanations of the photoelectric effect.

Answer:

A. electron