se·le·ni·um /səˈliniəm/
 非金屬元素,符號Se,原子序34


 se·le·ni·um /səˈlɪnɪəm/ 名詞



 selenium
 硒


 Se·le·ni·um n.  Chem. A nonmetallic element of the sulphur group of atomic number 34, analogous to sulphur in its compounds. It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.96.

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 selenium
      n : a toxic nonmetallic element related to sulfur and tellurium;
          occurs in several allotropic forms; a stable gray
          metallike allotrope conducts electricity better in the
          light than in the dark and is used in photocells; occurs
          in sulfide ores (as pyrite) [syn: Se, atomic number 34]


 selenium
 Symbol: Se
 Atomic number: 34
 Atomic weight: 78.96
 Metalloid element, belongs to group 16 of the periodic table. Multiple
 allotropic forms exist. Chemically resembles sulphur. Discovered in 1817
 by Jons J. Berzelius.