Key information
Atomic number: 
Atomic weight: 
2330 kg/m³
Boiling point: 
2953.16° K
Melting point: 
1683.16° K
Heat vapour: 
170.02 kJ/mol
Heat fusion: 
46.48 kJ/mol
Thermal conductivity: 
10 W/m/K
Specific heat capacity: 
83.75 J/kg/K

Silicon makes up about a quarter of the earth''s crust by weight, and is the second most abundant element, after oxygen. It is found in the form of the oxide, either anhydrous or hydrated as quartz, flint, sand, chalcedony, tridymite, opal, etc., but occurs chiefly in the form of silicates of aluminium, magnesium, iron, and the alkali and alkaline earth metals, forming the chief constituent of various clays, soils and rocks. Silicates can occur in the form of long-chain molecules as is the case with asbestos.

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages