![]() Naturally occurring xenon consists of seven stable isotopes and two long-lived radioactive isotopes. Xenon is also used to search for hypothetical weakly interacting massive particles and as a propellant for ion thrusters in spacecraft. The first excimer laser design used a xenon dimer molecule (Xe 2) as the lasing medium, and the earliest laser designs used xenon flash lamps as pumps. Xenon is used in flash lamps and arc lamps, and as a general anesthetic. Although generally unreactive, it can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized. It is a dense, colorless, odorless noble gas found in Earth's atmosphere in trace amounts. Xenon is a chemical element it has symbol Xe and atomic number 54. ![]()
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