Periodic Table of the Elements Selenium

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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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selenium

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

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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