J.J. Thomson 1897
Cathode Ray Experiment
The Cathode Ray Tube is a glass tube with wires inserted in both ends. Air would be removed as much as possible, so then an electric charge could pass through the glass tube from wire to wire. This could create a fluorescent glow. When JJ Thomson added a magnetic field, he observed that the fluorescent glow moved towards the positive end of the tube. With these observations in mind, he discovered that the cathode rays (electrons) were negatively charged. |
Atomic Model
Plum Pudding Model:
JJ Thomson called his atomic model the Plum Pudding model because the electrons reminded him of plums surronded by pudding (positive areas). |