Summary:
- A model gives an idea of what something looks like, but is not the real thing.
- J.J. Thomson developed what became known as the "plum pudding" model of the atom in 1904.
- In Thomson's model, the electrons were embedded in a uniform sphere of positive charge like blueberries stuck into a muffin.
- The goal of each atomic model was to accurately represent all of the experimental evidence about atoms in the simplest way possible.
- The electron was discovered by J. j. Thomson in 1897, and the existence of protons was also known.