| A | B |
|---|
| Democritus | Matter is discontinuous |
| Aristotle | Matter is continuous |
| Lavoisier | Law of Conservation of Mass |
| Proust | Law of Definite Proportions |
| Thomson | Discovered the Electron |
| Chadwick | Discovered the Neutron |
| Goldstein | Discovered the Proton |
| Millikan | Discovered the exact charge on an electron |
| Dalton | Formulated 1st Theory about Atomic Structure |
| Rutherford | Discovered the nucleus of the atom |
| Law of Electrostatics | Opposite charges attract; like charges repel |
| Alpha Particles | Positive Radioactive Particles |
| Proton | Positive Subatomic Particles |
| Electron | Negative Subatomic Particles |
| Neutrons | Neutral Subatomic Particles |
| Coulombs | SI Unit for Charge |
| Nucleus | Center of atom |
| Isotopes | Atoms of the same elements with different numbers of neutrons |
| Atomic Number | Number of protons; basis for periodic table |
| Mass Number | Number of protons plus neutrons |
