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SILICON (14Si28.0855)

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Element Description

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
Electronegativity 1.8Pauling's
Melting Point 1414°C Covalent Radius 1.11Angstroms
Boiling Point 2355°C Mohs Hardness @ 20°C 7.0
Density 2.33g/cm3 Electrical Resistivity 23x1010µΩ-cm
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

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