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Hemijski elemenat; upotrebljava se u tehnici, ponajviše u onoj koja je ugrađena u televiziju (grč.)
Element, metaloid, atomska težina 79.12, redni broj 34, znak Se, upotrebljava se u televiziji.
/ səliːniəm /
Množina reči selenium je selenia.
Se · atomic number 34
ETYM New Lat., from Greek selene the moon. So called because of its chemical analogy to tellurium (from Latin tellus the earth), being, as it were, a companion to it.
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.
Gray, nonmetallic element, symbol Se, atomic number 34, relative atomic mass 78.96. It belongs to the sulfur group and occurs in several allotropic forms that differ in their physical and chemical properties. It is an essential trace element in human nutrition.
Obtained from many sulfide ores and selenides, it is used as a red coloring for glass and enamel.
Because its electrical conductivity varies with the intensity of light, selenium is used extensively in photoelectric devices. It was discovered 1817 by Swedish chemist Jöns Berzelius and named for the Moon because its properties follow those of tellurium, whose name derives from Latin Tellus “Earth”.