| 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 |
| Energy | emitted from an electron when it drops from one level to another |
| Planetary Model | Rutherford's model of the atom |
| Plum Pudding Model | Thomson's model of the atom |
| Quantum Model | Bohr's model of the atom |
| Matter | has mass and takes up space |
| Elements | Found on the Periodic Table of Elements |
| Electron Cloud | Space where electrons are most likely found |
| Element Key | contains information about atoms of an element |
| Constant motion | What the particles that make up matter are in |
| Ready | How you feel about a test after you really study |
