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selenium

selenium Grey metalloid element of group VI of the periodic table, discovered (1817) by J. J. Berzelius. Its chief source is a by-product in the electrolytic refining of copper. It resembles sulphur. It is extensively used in photoelectric cells, solar cells, xerography and red pigments. Properties: at.no. 34; r.a.m. 78.96; r.d. 4.79; m.p. 217°C (422.6°F); b.p. 684.9°C (1265°F); most common isotope Se80 (49.82%).

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Periodic Table of the Elements: Selenium

Periodic Table of the Elements: Selenium

Periodic Table of the Elements: Selenium
Atomic Number: 34
Atomic Symbol: Se
  Selenium
Atomic Weight: 78.96
Electron Configuration: 2 · 8 · 18 · 6

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"Periodic Table of the Elements: Selenium." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 25 May. 2017 <http://www.encyclopedia.com>.

"Periodic Table of the Elements: Selenium." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (May 25, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/periodic-table-elements-selenium

"Periodic Table of the Elements: Selenium." The Columbia Encyclopedia, 6th ed.. . Retrieved May 25, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/periodic-table-elements-selenium