Fluorine (F) — Element 9: Properties & Data | Aladdin Scientific
Fluorine(F) — Element 9
Fluorine (F) is a halogen with atomic number 9 and atomic mass 18.9984. It has melting point 53.53 K (-220 °C), boiling point 85.03 K (-188 °C), density 0.001696 g/cm³. It sits in group 17 and period 2 of the periodic table and was discovered in 1670.
Key facts
| Atomic mass | 18.9984 u |
|---|---|
| Electron configuration | [He]2s2 2p5 |
| Oxidation states | -1 |
| Electronegativity (Pauling) | 3.98 |
| Atomic radius (van der Waals) | 135 pm |
| Ionization energy | 17.423 eV |
| Electron affinity | 3.339 eV |
| Melting point | 53.53 K |
| Boiling point | 85.03 K |
| Density | 0.001696 g/cm³ |
| Standard state | Gas |
| Year discovered | 1670 |
Frequently asked questions
What is the electron configuration of fluorine?
The ground-state electron configuration of fluorine is [He]2s2 2p5.
What group and period is fluorine in?
Fluorine (F) is in group 17 and period 2 of the periodic table, classified as a halogen.
What is the melting point of fluorine?
Fluorine melts at 53.53 K (-220 °C).
What is the standard state of fluorine?
Fluorine is a gas at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .