- noun an inert gas, traces of which are found in the atmosphere
- A colorless and odorless noble gas whose atomic number is 54. Although it is in the noble gas group of the periodic table, it does has limited reactivity. It is present in very small amounts in the atmosphere, and has over 35 known isotopes, of which 8 are stable. It is used, for instance, in high-intensity arc lamps, flash lamps, radiation detectors, lasers, and semiconductors. Its chemical symbol is Xe.
- chemical symbol Xe
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