what are some of the experiments conducted by that scientist you mentioned?
One such experiment was Cathode rays. He marked the paths of particles of matter charged with negative electricity
J. J. Thomson
Earlier, physicists debated whether cathode rays were immaterial like light ("some process in the aether") or were "in fact wholly material, and ... mark the paths of particles of matter charged with negative electricity", quoting Thomson. The aetherial hypothesis was vague, but the particle hypothesis was definite enough for Thomson to test.
what is the exact mass of an electron Approximately 1/1836 that of the proton is the electron a positive charge or a negative charge or is it neutral? Negative charge can you describe any experiment in short where this charge can be produced? UNANSWERABLE what are the names of the scientists who are involved in the discovery of this negative charge? J. J. Thomson what are the applications of this kind of charge? Cathode ray tubes,  computer monitors, television sets,  Vacuum tubes, etc.
wiki:13393125
J. J. Thomson [SEP] Experiments with cathode rays
Earlier, physicists debated whether cathode rays were immaterial like light ("some process in the aether") or were "in fact wholly material, and ... mark the paths of particles of matter charged with negative electricity", quoting Thomson. The aetherial hypothesis was vague, but the particle hypothesis was definite enough for Thomson to test.