- Gases, Rare
- found: Encyc. Britannica online, Aug. 31, 2012 (xenon (Xe), chemical element, a heavy and extremely rare gas of Group 18 (noble gases) of the periodic table. It was the first noble gas found to form true chemical compounds.)
- found: Wikipedia, Aug. 31, 2012 (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.)
- found: The element xenon, via It's elemental website, Aug. 31, 2012 (Xenon; Xe; Phase at Room Temperature: Gas; Element Classification: Non-metal; Period Number: 5; Group Number: 18; Group Name: Noble Gas)
- 1986-02-11: new
- 2012-12-06: revised
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