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.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • 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

  • Sélenium — Sélénium Sélénium Arsenic …   Wikipédia en Français

  • SÉLÉNIUM — Le sélénium a été découvert en 1817 par Jöns Jacob Berzelius dans les boues des chambres de plomb utilisées pour la préparation de l’acide sulfurique. C’est un élément rare, présent très souvent à l’état de traces dans les sulfures naturels où il …   Encyclopédie Universelle

  • Selenium — Entwickler ThoughtWorks Aktuelle Version 2.11.0 (28. Oktober 2011) Betriebssystem Microsoft Windows, Linux, Mac OS X, Solaris, FreeBSD und andere Unix Varianten (basiert auf …   Deutsch Wikipedia

  • Selenium-79 — is a radioisotope of selenium present in spent nuclear fuel and the wastes resulting from reprocessing this fuel. It is one of only 7 long lived fission products. Its yield is low (about 0.04%) as it it is near the lower end of the mass range for …   Wikipedia

  • selenium — SELÉNIUM s.n. v. seleniu. Trimis de LauraGellner, 13.09.2007. Sursa: DEX 98  SELÉNIUM s.n. v. seleniu. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • Selenĭum — (Chem.), so v.w. Selen …   Pierer's Universal-Lexikon

  • 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”