Write about Xenon atom.

     

Xenon is a chemical element with the symbol Xe and atomic number 54.  It is a colorless, dense, odorless noble gas found in 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 has compounds to be synthesized. 

     Xenon is used in flash lamps and arclamps, and as a general anesthetic.  The first excimer laser design used a xenon dimer molecule 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 seven stable isotopes and two long-lived radioactive isotopes.  More than 40 unstable xenon isotopes undergo radioactive decay, and the isotope rations of xenon are an important tool for studying the early history of the Solar system.