Selenium

Selenium
Selenium Se*le"ni*um, n. [NL., from Gr. selh`nh the moon. So called because of its chemical analogy to tellurium (from L. tellus the earth), being, as it were, a companion to it.] (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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Selenium — (pronEng|səˈliniəm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its elemental state in nature …   Wikipedia

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  • 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 …   Elements of periodic system

  • selenium — (n.) element name, Modern Latin, from Gk. selene moon (see SELENE (Cf. Selene)). Named by Berzelius (1818), on analogy of TELLURIUM (Cf. tellurium), with which it had been at first confused, and which was named for the earth. Despite the ium… …   Etymology dictionary

  • selenium — [sə lē′nē əm] n. [ModL: so named (1818) by BERZELIUS Baron Jöns Jakob < Gr selēnē, the moon (see SELENE) + IUM, by analogy with TELLURIUM, with which it was assoc. in the ore] a nonmetallic chemical element with several allotropic forms, used… …   English World dictionary

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