| A | B |
|---|
| Atom | The smallest particle of matter |
| Proton | A positively charged particle found in the nucleus of an atom. |
| Electron | A negatively charged particle found orbiting the nucleus. |
| Neutron | A particle with no charge that is found in the nucleus of the atom. |
| Atomic Number | Equal to the number of protons |
| Mass Number | The mass of the nucleus (protons + neutrons) |
| Ion | A charged particle |
| Cation | A positively charged ion |
| Anion | A negatively charged ion |
| Valence Electron | An electron found on the outermost edge of the atom. It's involved in chemical bonding. |
