Xenon is a chemical element represented by the symbol Xe. The element name is pronounced /ˈzɛnɒn/, ZEN-on or /ˈziːnɒn/, ZEE-non. Its atomic number is 54. A colorless, heavy, odorless noble gas, xenon 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.

Naturally occurring xenon consists of nine stable isotopes. There are also over 40 unstable isotopes that undergo radioactive decay. The isotope ratios of xenon are an important tool for studying the early history of the Solar System. Xenon-135 is produced as a result of nuclear fission? and acts as a neutron absorber? in nuclear reactors?.

Xenon is used in flash lamps? and arc lamps?, and as a general anesthetic?. The first excimer laser? design used a xenon dimer molecule (Xe2) as its lasing medium, and the earliest laser designs used xenon flash lamps? as pumps. Xenon is also being used to search for hypothetical weakly interacting massive particles and as the propellant for ion thrusters in spacecraft. Wikipedia

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