| Fluorine ✕ | |
|---|---|
| Symbol | F |
| Atomic number | 9 |
| Chemical property | Reactive nonmetal |
| Origin o the name | the Latin fluere, 'to flow' |
| Group | 17 |
| Period | 2 |
| Atomic weight (u) | 18.998403 |
| Atomic weight uncertainty (u) | 0 |
| Density (g/cm³) | 0.001696 |
| Melting point (K) | 53.53 |
| Boiling point (K) | 85.03 |
| Heat capacity (J/(g·K)) | 0.824 |
| Electro-negativity | 3.98 |
| Abundance in earth's crust (mg/kg) | 585 |