Question

what do you mean by discovery of electron and protron

Answer 1

most of the atom mass its entire positive charge are confined in a small core called nucleus.
positive charge called proton.
negative charge called called electron

Answer 2

Explanation:

The Discovery of the Electrons

Thomson also determined e/m, ratio of the charge e to the mass m of the material particle which constituted these rays. ... Protons are positively charged particles that reside in the nucleus of an atom. These protons add the overall positive charge of an atom.