Fluorine (F)
Fluorine (F) is element 9 of the periodic table, a halogen in period 2 and group 17. Its standard atomic weight is 18.998403162, so one mole of fluorine atoms has a mass of 18.998403162 g. At room temperature it is a gas; it melts at -219.62 °C and boils at -188.12 °C.
| Atomic number | 9 |
|---|---|
| Symbol | F |
| Standard atomic weight | 18.998403162 |
| Molar mass | 18.998403162 g/mol |
| Category | Halogen |
| Group | 17 |
| Period | 2 |
| Block | p-block |
| Electron configuration | [He] 2s2 2p5 |
| Oxidation states | −1 |
| Electronegativity (Pauling) | 3.98 |
| Atomic radius (van der Waals) | 135 pm |
| First ionisation energy | 17.423 eV (1681.1 kJ/mol) |
| Electron affinity | 3.339 eV |
| State at room temperature | Gas |
| Melting point | 53.53 K (-219.62 °C) |
| Boiling point | 85.03 K (-188.12 °C) |
| Density | 1.696 g/L |
| Discovered | 1670 |
Group 17
Calculate with Fluorine
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.