Question

who discovered the electron, Proton and neutron ​

Answer 1

The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle, distinct from the proton.

Answer 2

Protons were discovered by Ernest Rutherford, in his famous gold foil experiment.

Electrons were discovered by J.J. Thomson, in his cathode ray tube experiment.

Neutrons were discovered by James Chadwick.