Xenon is a chemical element with the symbol Xe and atomic number 54. It is a colorless, heavy, odorless noble gas, that 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.Symbol: Xe
Electron configuration: Kr 4d10 5s2 5p6
Atomic number: 54
Electronegativity: 2.6
Discovered: 1898
Atomic mass: 131.293 ± 0.006 u