| A | B |
|---|
| Proton(s) | Atomic number refers to the number of ____ in the atom |
| Neutron(s) | A particle in the nucleus that has no charge |
| Electron(s) | These particles orbit the nucleus |
| Isotope(s) | Atoms with the same numbers of protons but different numbers of neutrons |
| Ion(s) | Atoms with the same numbers of protons but different numbers of electrons |
| Positive | The charge of the nucleus |
| Negative | The charge of an electron |
| Neutral | An atom in which the numbers of electrons equals the number of protons is ___ |
| Protons and electrons | Used to determine the total charge of the atom |
| Protons and neutrons | The particles that make up the nucleus |
| Noble gases | A family of elements that don't react |
| Nucleus | The massive center of an atom |
| Different element(s) | Have different numbers of protons |
| Alkali Metals | A family of soft metals that can be cut with a knife |
| Halogens | A family of gases that need one electron to complete their outer shell |
| Gases | Found on the right side of the periodic table |
| Metals | Found on the left side of the periodic table |
| Mercury | A metal that is liquid at room temperature |
| Neon | A noble gas that doesn't react with anything |
| Fluorine | A highly reactive halogen gas |
