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Fluorine (F)
Atomic number 9 · Halogen
| Atomic number | 9 |
|---|---|
| Atomic mass | 18.9984 u |
| Molar mass | 18.9984 g/mol |
| Category | Halogen |
| Group / period / block | 17 / 2 / p |
| Electron configuration | [He] 2s2 2p5 |
| Electrons per shell | 2, 7 |
| Electronegativity (Pauling) | 3.98 |
| Atomic radius | 50.0 pm |
| Density | 0.00155 g/cm³ |
| First ionisation energy | 17.4228 eV |
| Melting point | 53.48 K (-219.67 °C) |
| Boiling point | 85.04 K (-188.11 °C) |
| Common oxidation states | -1 |
| Abundance in Earth's crust | 585 ppm |
Uses
Fluoride toothpaste, Teflon, refrigerants
Discovery
1886, Henri Moissan