JJ Thomson

Plum Pudding Model

The Cathode Ray Tube Experiment

In 1895, JJ Thomson shot a gas laser into a tube with positive and negative charged plates on opposite sides of the tube. Then the laser hit the positive plate showing it has a negative charge. This is how the discovery of electrons were made. Two years later in 1897, JJ discovered the electron.

The Plum Pudding Model

In 1897, the plum pudding model was proposed by JJ Thomson. The plum pudding model is a positively charged atom with negatively charged particles known as electrons. The plum pudding model wasn't fully accurate because the protons and electrons were embedded in the atom in random places. The protons and neutrons should be in the center to create the nucleus. What is correct about the model, is that there were electrons within the atom.