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Periodic table / Noble gases

54Xenon

Xenon is a noble gase in group 18, period 5. At 25 °C it is a gas.

Xe
Shells: 2, 8, 18, 18, 8. A simple picture: electrons do not move in circles.
Symbol
Xe
Atomic number
54 protons in the nucleus
Standard atomic weight
131.29 ± 0.01
Electron configuration
[Kr] 4d10 5s2 5p6
Electrons in each shell
2, 8, 18, 18, 8
Group, period, block
18, 5, p
Family
Noble gases
State at 25 °C
gas
Electronegativity
2.6 (Pauling scale)
First ionisation energy
1170.4 kJ/mol (12.1298437 eV)
Where these numbers come from

Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.