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Xenon (Xe)

Xenon is a chemical element of the periodic table with chemical symbol Xe and atomic number 54 with an atomic weight of 131.294 u and is classed as noble gas and is part of group 18 (noble gases). Xenon is gas at room temperature.

Xenon in the periodic table

Atomic number54
Group18 (Noble gases)
ClassificationNoble Gas
AppearanceColorless gas, exhibiting a blue glow when placed in a high voltage electric field
Color Colorless
Number of protons54 p+
Number of neutrons77 n0
Number of electrons54 e-
From Wikipedia, the free encyclopediaXenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas, that occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.

Physical properties

Phase at STPGas
Density5.894 g/cm3
Atomic weight131.294 u

Thermal properties

Melting point161.4 K
-111.75 °C
-169.15 °F
Boiling point165.051 K
-108.099 °C
-162.5782 °F
Heat of vaporization12.64 kJ/mol

Atomic properties

Electronegativity (Pauling Scale)2.6
Electron affinity-77 kJ/mol
Oxidation states0, +1, +2, +4, +6, +8
(rarely more than 0; a weakly acidic oxide)
Ionization energies
  1. 1170.4 kJ/mol
  2. 2046.4 kJ/mol
  3. 3099.4 kJ/mol

Electron configuration for xenon

Electron configuration
Shorthand configuration
[Kr] 4d10 5s2 5p6
Electron configuration
Full configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
Electron configuration chart
Electrons per shell2, 8, 18, 18, 8
Valence electrons 8
Valency electrons 0
Bohr model
XenonElectron shell for Xenon, created by Injosoft ABXe
Figure: Shell diagram of Xenon (Xe) atom.
Orbital Diagram

The history of Xenon

Discovery and first isolationWilliam Ramsay, Morris Travers (1898)
Named byWilliam Ramsay (1898)
Discovery of xenon
Xenon was discovered in England by the Scottish chemist William Ramsay and English chemist Morris Travers in September 1898, shortly after their discovery of the elements krypton and neon. They found xenon in the residue left over from evaporating components of liquid air. Ramsay suggested the name xenon for this gas from the Greek word ξένον xénon, neuter singular form of ξένος xénos, meaning 'foreign(er)', 'strange(r)', or 'guest'.


List of unique identifiers for Xenon in various chemical registry databases
CAS Number7440-63-3
ChemSpider ID22427
EC number231-172-7
PubChem CID Number23991