| A | B |
| 1 Dalton | 1 Same element = Same atoms |
| 2 Dalton | 1 Elements combine in specific proportions |
| 1 Thompson | 1 Plum pudding |
| 2 Thompson | 2 Discovered electrons |
| 1 Rutherford | 1 Gold Foil |
| 2 Rutherford | 2 Discovered nucleus & empty space |
| 3 Rutherford | 3 Most went through & some deflected / bounced back |
| 1 Bohr | 1 Electrons orbit in specific paths |
| 1 Schroedinger & Heisenberg | 1 Electron Cloud Model |
| 1 Democritus | 1 Proposed atoms existence |
| 2 Democritus | 2 Named atoms & believed they couldn't be cut |