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Xenon

Chemical element
Xenon is a chemical element; it has symbol Xe and atomic number 54. It is a dense, colorless, odorless noble gas found in Earth's atmosphere in trace amounts. Wikipedia
Symbol: Xe
Atomic number: 54
Atomic mass: 131.293 u
Electron configuration: [Kr] 4d¹⁰ 5s² 5p⁶
Melting point: -169.2°F (-111.8°C)
Discovered: 1898