They measured the amount of different isotopes of xenon trapped in quartz crystals.
That report was enough to make a man quit his job and go to xenon to start a chicken ranch or grow oranges.
Aristarchus combated “the paradox of xenon,” and it does not seem to have had much acceptance in antiquity.
The evidence for the existence of krypton and xenon is, however, inconclusive.
The remaining elements of this group—neon, krypton, and xenon—have been obtained from liquid air.
The animals on xenon are immune from them, but when they land on a man, they send out tiny rootlets that are like minute hairs.
xenon xe·non (zē'nŏn')
A colorless, odorless, highly unreactive gaseous element found in minute quantities in the atmosphere and extracted commercially from liquefied air. Atomic number 54; atomic weight 131.29; melting point -111.8°C; boiling point -108.0°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C).
A colorless, odorless element in the noble gas group occurring in extremely small amounts in the atmosphere. It was the first noble gas found to form compounds with other elements. Xenon is used in lamps that make intense flashes, such as strobe lights and flashbulbs for photography. Atomic number 54; atomic weight 131.29; melting point -111.9°C; boiling point -107.1°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C). See Periodic Table.