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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

SymbolXe
Atomic number54
Group18
Period5
Blockp
Element categoryNoble Gas

Physical properties

Phase at STPGas
Density5.894 g/cm3
Atomic weight131.294 u
Melting point161.4 K
-111.75 °C
-169.15 °F
Boiling point165.051 K
-108.099 °C
-162.5782 °F

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
11170.4 kJ/mol
2 2046.4 kJ/mol
3 3099.4 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Kr] 4d10 5s2 5p6
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
Electrons per shell2, 8, 18, 18, 8

History

Discovered1898
Discovered byWilliam Ramsay
Morris Travers
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