J.J. Thomson
J.J Thomson measured a degree to which both a magnetic field and an electric field. He created the cathode ray, it composed negative particles. Atoms are not invisible balls but instead had a substructure. He determined the ratio of an electrons electrical charge to its mass => 1.76 x 10^8 coulombs per gram. He concluded that atoms contain electrons that are negatively charged particles. His only question:
How are positive and negative charges arranged in the atom?
How are positive and negative charges arranged in the atom?