| A | B |
|---|
| Dalton | Had an atomic theory with 4 main principles. |
| Rutherford | Discovered the nucleus. |
| Thomson | Discovered the electron. |
| Electron | Negatively charged subatomic particle |
| Proton | Positively charged subatomic particle |
| Neutron | Neutrally charged subatomic particle |
| Nucleus | contains protons and neutrons |
| Atomic Number | Tells the number of protons in an atom |
| Mass Number | number of protons plus neutrons in an atom |
| Democritus | First person to talk about atoms |
| Plum Pudding Model | Thomson's model of the atom |
| Planetary | Bohr's model of the atom |
