SILICON [[[symbol]] Si, atomic weight 28.3 (0=16)], a nonmetallic chemical element.
Compared with nonmetallic solids, they in general are good conductors of heat and of electricity.
46 (1888); Florida, South Carolina and Canadian Phosphates, by C. C. Hoyer Miller (London, 1892); and The Nonmetallic Minerals, by G.
The chlorides of the nonmetallic elements are usually volatile fuming liquids of low boilingpoint, which can be distilled without decomposition and are decomposed by water.
SELENIUM [[[symbol]] Se, atomic weight 79.2 (0 =16)], a nonmetallic chemical element, discovered in 1817 by J.