Krypton

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

Krypton (Kr) is chemical element 36, a noble gas in group 18, period 4 (PubChem).

Atomic number: 36
Symbol: Kr
Group: 18
Period: 4
Atomic mass: 83.80 u
Electron configuration: [Ar]4s2 3d10 4p6
Electronegativity (Pauling scale): 3
Atomic radius (van der Waals): 202 pm
Ionization energy: 14.000 eV
Oxidation states: 0
Standard state: Gas
Melting point: 115.79 K
Boiling point: 119.93 K
Density: 0.003733 g/cm³
Chemical group: Noble gas
Year discovered: 1898

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