| A | B |
|---|
| Millikan | discovered the charge and mass of electons |
| Rutherford | discovered the nuclear atom |
| Democritus | philosophized that matter was made of tiny indivisible particles |
| Thomson | plum pudding atomic model - electrons scattered in positively charged cloud |
| Moseley | ordered the periodic table by atomic number |
| Mendeleev | ordered the periodic table by atomic mass |
| Goldstein | found evidence that protons existed using canal rays |
| Dalton | postulated that all atoms of an element are identical |
| Chadwick | discovered the neutron |
