xe·non /ˈziˌnɑn, ˈzɛ-/
 氙,稀有氣體元素,符號Xe


 xe·non /ˈzɪˌnɑn, ˈzɛnˌɑn/ 名詞
 氙


 Xen·on n.  Chem. A very heavy, inert gaseous element of the noble gas group, occurring in the atmosphere in the proportion of one volume is about 20 millions.  It was discovered by Ramsay and Travers in 1898.  It can be condensed to a liquid boiling at -107° C., and to a solid which melts at -111.9° C.  Symbol Xe (formerly also X); atomic number 54; atomic weight 131.3.

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 xenon
      n : a colorless odorless inert gaseous element occurring in the
          earth's atmosphere in trace amounts [syn: Xe, {atomic
          number 54]


 xenon
 Symbol: Xe
 Atomic number: 54
 Atomic weight: 131.30
 Colourless, odourless gas belonging to group 18 on the periodic table (the
 noble gases.) Nine natural isotopes and seven radioactive isotopes are
 known. Xenon was part of the first noble-gas compound synthesized.
 Several others involving Xenon have been found since then. Xenon was
 discovered by Ramsey and Travers in 1898.