Fluorine

Document v1 · published by Koskamo · updated 2026-10-04

Fluorine (F) is chemical element 9, a halogen in group 17, period 2 (PubChem).

Atomic number: 9
Symbol: F
Group: 17
Period: 2
Atomic mass: 18.99840316 u
Electron configuration: [He]2s2 2p5
Electronegativity (Pauling scale): 3.98
Atomic radius (van der Waals): 135 pm
Ionization energy: 17.423 eV
Electron affinity: 3.339 eV
Oxidation states: -1
Standard state: Gas
Melting point: 53.53 K
Boiling point: 85.03 K
Density: 0.001696 g/cm³
Chemical group: Halogen
Year discovered: 1670

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1