Iodine Cesium

Xenon (Xe)

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.

Xenon in the periodic table

Symbol

Atomic number

Group

Period

Block

Element category

Noble Gas

Physical properties

Phase at STP

Gas

Density

5.894 g/cm³

Atomic weight

131.294 u

Melting point

161.4 K
-111.75 °C
-169.15 °F

Boiling point

165.051 K
-108.099 °C
-162.5782 °F

Atomic properties

Electronegativity (Pauling Scale)

2.6

Electron affinity

-77 kJ/mol

Oxidation states

0, +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

Elektronkonfiguration (shorthand)

[Kr] 4d¹⁰ 5s² 5p⁶

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶

Electrons per shell

2, 8, 18, 18, 8

History

Discovered

1898

Discovered by

William Ramsay
Morris Travers