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Crystalline silicon is a lustrous, grayish-black color, while the amorphous form is a dark brown powder. Making up 25% of the earth's crust, silicon is the second most abundant element, following oxygen. Silicon is not found free in nature, but can form more compounds than any other element, except carbon. It is the most important semiconducting element. Silicon and its many compounds have some of the most useful mechanical, optical, thermal, and electrical properties known.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(14Si28.0855)||Atomic Volume||12.1W/D|
|CAS #||7440-21-3||First Ionization Energy||188K-cal/g-mole|
|Melting Point||1414°C||Covalent Radius||1.11Angstroms|
|Boiling Point||2355°C||Mohs Hardness @ 20°C||7.0|
|Themal Conductivity||0.20cal/cm2/cm/s/°C||Crystal Structure||Diamond|
|Specific Heat @ 25°C||0.162cal/g°C||Critical Temperature||4920°C|
|Heat of Fusion||11.1k-cal/g-atom||Critical Pressure||1450atm|
|Heat of Vaporization B.P.||40.6k-cal/g-atom|