Sir Joseph John "J. J." Thomson
Atomic model
J.J Thomson
Experiment with + and - electrons
Plum putting experiment
Discovered:
He discovered electrons and how they are negative and positive. He was only looking at electrons because he was curious.
Experiment:
He exposed the stream of cathode rays to a magnet, the stream bends. the magnets can only affect matter, so the stream would have positive or negative electrons.
Plum Pudding Model
The fluid was called the "pudding." Scattered in this fluid were electrons known as the "plums." The radius of the model was 10-10 meters. Thomson suggested that the positive fluid held the negative charges, the electrons, in the atom because of electrical forces.