| A. | Dalton |  | There are positively charged particles in atoms. | 
| B. | Bohr |  | Electrons move around the nucleus in orbit patterns. | 
| C. | Rutherford |  | All matter is made of atoms. | 
| D. | De Broglie and Schrödinger |  | Electrons are in a cloud around the nucleus. | 
| E. | Chadwick |  | Neutrons exist. | 
| F. | Mendeleev |  | The periodic table is organized by atomic number. | 
| G. | Moseley |  | The periodic table is organized by atomic mass. |