Francium

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

Francium (Fr) is chemical element 87, an alkali metal in group 1, period 7 (PubChem).

Atomic number: 87
Symbol: Fr
Group: 1
Period: 7
Atomic mass: 223.01973 u
Electron configuration: [Rn]7s1
Electronegativity (Pauling scale): 0.7
Atomic radius (van der Waals): 348 pm
Ionization energy: 3.9 eV
Electron affinity: 0.47 eV
Oxidation states: +1
Standard state: Solid
Melting point: 300 K
Chemical group: Alkali metal
Year discovered: 1939

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