kryp·ton /ˈkrɪpˌtɑn/
 氪


 kryp·ton /ˈkrɪpˌtɑn/ 名詞
 氪


 Kryp·ton n.  Chem. An inert gaseous element of the argon (noble gas) group, of atomic number 36, occurring in air to the extent of about one volume in a million.  It was discovered by Ramsay and Travers in 1898.  Boiling point, -152.3° C.; melting point, -156.6° C.; symbol, Kr; atomic weight, 83.8.

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 krypton
      n : a colorless element that is one of the six inert gasses;
          occurs in trace amounts in air [syn: Kr, {atomic number
          36]


 krypton
 Symbol: Kr
 Atomic number: 36
 Atomic weight: 83.80
 Colorless gaseous element, belongs to the noble gases. Occurs in the air,
 0.0001% by volume. It can be extracted from liquid air by fractional
 distillation. Generally not isolated, but used with other inert gases in
 fluorescent lamps. Five natural isotopes, and five radioactive isotopes.
 Kr-85, the most stable radioactive isotope, has a half-life of 10.76
 years and is produced in fission reactors. Practically inert, though known
 to form compounds with fluorine.