| A | B |
|---|
| Like negatively charged plums in positively charged pudding | Thomson's Model |
| Proved existence of nucleus | Rutherford's Gold Foil Experiment |
| Named atom "atomos" Greek for "indivisible" | Democritus |
| Atoms are tiny, solid spheres like billiard ball | Dalton's Model |
| "Solar System" Model-electrons travel on definite paths surrounding nucleus | Bohr Model |
| Electrons located in a cloud surrounding nucleus | Modern Model |
| Neutrons add to the mass of atom | Chadwick's Theory |
| First to discover a subatomic particle | JJ Thomson |
