Chemistry / Chem 2355 · Atom · ~20 seconds
Noble Gas Unreactivity and the Xenon Exception
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Noble gases were long assumed entirely unreactive because of filled valence shells, until Bartlett's 1962 xenon compound showed heavier noble gases do react under the right conditions.
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Xenon reacts with fluorine gas to form xenon difluoride, one of several known stable xenon-fluorine compounds.
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"Noble gas" describes a strong tendency, not an absolute law — "never reactive" misreads the group's corrected history.
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