Ksenon

Kemiallinen merkki: Xe
Järjestysluku: 54
Kategoria: jalokaasut
Ryhmä: 18
Jakso: 5
Lohko: p
Moolimassa: 131,293 g/mol
Elektronia kuorilla: 2, 8, 18, 18, 8
CAS-numero: 7440-63-3
Olomuoto: kaasu
Tiheys: 5,894 g/l (0 °C, 101,325 kPa)
Sulamispiste: (101,325 kPa) 161,4 K (-111,7 C,
-169,1 °F)
Kiehumispiste: (101,325 kPa) 165,03 K (-108,12 C,
-162,62 °F)
Kiderakenne: cubic face centered
Hapetusluvut: 0, 1, 2, 4, 6, 8
Elektronegatiivisuus: 2,6 (Pauling-asteikko)
Nimen alkuperä: xenos
Nimen tarkoitus: a Greek word which means 'stranger' because it's found so little in the Earth's atmosphere
Faktoja:
- occurs in the Earth's atmosphere in trace amounts (0,087 ppm)
- 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
- is used in flash lamps and arc lamps, and as a general anesthetic
- is also being used to search for hypothetical weakly interacting massive particles and as the propellant for ion thrusters in spacecraft
- can be safely kept in normal sealed glass or metal containers at standard temperature and pressure, although it readily dissolves in most plastics and rubber, and will gradually escape from a container sealed with such material
- naturally occurring xenon consists of nine stable isotopes, and there are also over 40 unstable isotopes that undergo radioactive decay