Fluorine
Halogen| Atomic number | 9 |
|---|---|
| Category | Halogen |
| Atomic mass | 18.998 |
| Electron configuration | [He]2s² 2p⁵ |
| Oxidation states | −1 |
| Electronegativity | 3.98 |
| Melting point | -220 °C |
| Boiling point | -188 °C |
| Density | 0.002 g/cm³ |
| Crystal structure | Cubic (solid) |
| Group | 17 |
| Period | 2 |
| Block | p |
| Discovered | 1,886 |
| Crustal abundance | 585 ppm |
