He was also the person who first identified silicon, selenium, thorium, and serium.
When heated in a tube, oxide of selenium of a carmine red rises along with selenic acid, white and deliquescent.
Why, mirrors and selenium are, at best, ten per cent efficient!
selenium and tellurium behave similarly, but form crystalline solid fluorides.
It is found associated likewise with selenium and tellurium.
If there be a mixture of selenium present, then the color of the flame is bluish-green.
selenium, indispensable in the apparatus, was discovered by Berzelius in 1817.
No attempt has ever been made to compile a bibliography of selenium organic compounds.
Luckily I've got plenty of selenium plates for the sending end.
selenium undergoes but slight oxidation, but it becomes readily volatilized, and may be observed on the cool portion of the tube.
selenium se·le·ni·um (sĭ-lē'nē-əm)
A nonmetallic element, with red, black, and gray allotropic forms, resembling sulfur and obtained primarily as a byproduct of electrolytic copper refining. Atomic number 34; atomic weight 78.96; melting point (of gray selenium) 221°C; boiling point (gray) 684.9°C; specific gravity (gray) 4.79; (black) 4.28; valence 2, 4, or 6.
A nonmetallic element that occurs in a gray crystalline form, as a red powder, or as a black glassy material. It is highly photosensitive and can be used to convert light into electricity. Its ability to conduct electricity also increases with higher exposure to light. For these reasons selenium is used in photocopying technology, photography, and solar cells. Atomic number 34; atomic weight 78.96; melting point 217°C; boiling point 684.9°C; specific gravity (gray) 4.79; (red) 4.5; (black) 4.28; valence 2, 4, or 6. See Periodic Table.