Periodic Table of Elements




Xenon was discovered in England by the Scottish chemist William Ramsay and English chemist Morris Travers on July 12, 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.

Name: Xenon
Symbol: Xe
Atomic number: 54
Atomic weight: 131.29
State: gas
Group, period, block: 18, 5, p
Color: colorless gas
Classification: noble gases
Electron configuration: 5s2 4d10 5p6

Physical properties

Density: 5.894 g/L
Melting point: 161.4 K, -111.7 C, -169.1 F
Boiling point: 165.03 K, -108.12 C, -162.62 F

Atomic properties

Oxidation states: 0, +1, +2, +4, +6, +8
Electronegativity: 2.6 (Pauling scale)
Ionization energies: 1st: 1170.4 kJmol-1
Covalent radius: 1409 pm
Van der Waals radius: 216 pm
  • Xe
  • Electron Configuration


There are nine naturally occurring isotopes of xenon exist, 124Xe, 126Xe, 128Xe, 129Xe, 130Xe, 131Xe, 132Xe, 134Xe, and 136Xe.