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9
F
18.998
Fluorine
Halogens · Group 17 · Period 2
Atomic properties
| Atomic number | 9 |
|---|---|
| Symbol | F |
| Standard atomic weight | 18.998 |
| Classification | Halogens |
| Group | 17 |
| Period | 2 |
| Block | p-block |
| Electron configuration | [He] 2s2 2p5 |
| Electronegativity (Pauling) | 3.98 |
| Common oxidation states | -1 |
Physical properties
| Phase at 20 °C | Gas |
|---|---|
| Density | 0.001696 g/cm³ |
| Melting point | -219.67 °C |
| Boiling point | -188.11 °C |
| Discovered | 1886 |
| CAS number | — |