Xenon
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 Xenon facts

• It is a colorless, dense, odorless noble gas found 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 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 the lasing medium, and the earliest laser designs used xenon flash lamps as pumps
• Xenon is used to search for hypothetical weakly interacting massive particles and as the propellant for ion thrusters in spacecraft
• Naturally occurring xenon consists of eight stable isotopes
• More than 40 unstable xenon isotopes undergo radioactive decay, and the isotope ratios of xenon are an important tool for studying the early history of the Solar System
• Radioactive xenon-135 is produced by beta decay from iodine-135 (a product of nuclear fission), and is the most significant neutron absorber in nuclear reactors