Radon

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

Radon (Rn) is chemical element 86, a noble gas in group 18, period 6 (PubChem).

Atomic number: 86
Symbol: Rn
Group: 18
Period: 6
Atomic mass: 222.01758 u
Electron configuration: [Xe]6s2 4f14 5d10 6p6
Atomic radius (van der Waals): 220 pm
Ionization energy: 10.745 eV
Oxidation states: 0
Standard state: Gas
Melting point: 202 K
Boiling point: 211.45 K
Density: 0.00973 g/cm³
Chemical group: Noble gas
Year discovered: 1900

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