54 Xe

Noble gas

Xenon

Used in car headlights.

See it in the interactive periodic table

Properties of Xenon

Atomic number (Z)
54
Symbol
Xe
Atomic mass
131.29 g/mol
Category
Noble gas
Group
18
Period
5
Electron configuration
[Kr] 4d¹⁰ 5s² 5p⁶
Electronegativity (Pauling)
2.6
Atomic radius
108 pm
First ionization energy
1170 kJ/mol
Melting point
161.4 K (-111.7 °C)
Boiling point
165.03 K (-108.1 °C)
Density
0.005887 g/cm³
Phase at 25 °C
Gas
Discovered
Discovered in 1898
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