Atomic number:54

Group numbers:18

Period:5

Electronic configuration:[Kr] 4d¹⁰ 5s² 5p⁶

Formal oxidation number:0

Electronegativities:2.6

Atomic radius / pm:216

Relative atomic mass:131.293 ± 0.006

 

Xenon was discovered by Sir William Ramsay and Morris William Travers (GB) in 1898. The origin of the name comes from the Greek word xenos meaning stranger. It is a heavy, colourless, odourless, noble gas that reacts only with fluorine. Xenon is obtain from the small quantities in liquid air. It is used for filling flash lamps and other powerful lamps. Electrical excitation of xenon produces a burst of brilliant white light. It is also used in bubble chambers and modern nuclear power reactors.

Density / g dm^-3:3540 (solid, m.p.)

 2939 (liquid, b.p.)

 5.8971 (gas, 273 K)

Molar volume / cm³mol^-1:37.09 (solid, m.p.)

 44.67 (liquid, b.p.)

 22263.99 (gas, 273 K)

Electrical resistivity / μΩcm:- (20 °C)

Thermal conductivity / W m^-1K^-1:0.0056

Melting point / °C:-111.75

Boiling point / °C:-108.0

Heat of fusion / kJ mol^-1:3.1

Heat of vaporization / kJ mol^-1:12.65

Heat of atomization / kJ mol^-1:0

1st ionization energy / kJ mol^-1:1170.36

2nd ionization energy / kJ mol^-1:2046.45

3rd ionization energy / kJ mol^-1:3099.42

in the atmosphere / ppm:0.086

in the Earth's crust / ppm:0.000002

in the oceans / ppm:0.000047