| A | B |
|---|
| Nucleus | The center of an atom |
| Element | Substance made up of only one kind of atom |
| Proton | Subatomic particle with a positive charge |
| Atom | Smallest uint of an element with all the properties of that element |
| Neutron | Subatomic particle with no charge |
| Periodic Table | Arrangement of elementas by similar properties |
| Compound | Substance made up of the atoms of two or more elements |
| Molecule | Two or more atoms joined together |
| Electron | Subatomic particle with a negative charge |
| positive | proton's charge |
| negative | electron's charge |
| neutral | neutron's charge |
| proton | positive particle in the nucleus |
| electron | particle in a cloud |
| atomic mass | total number of protons and neutrons |
| atomic number | number of protons or electrons |
