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Element Details

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SELENIUM (34Se78.96)

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Element Description

Amorphous selenium is either a reddish powder or a black, vitreous solid; crystalline selenium is either red or gray, depending on the crystal structure. This element resembles sulfur in its various forms and in its compounds. Selenium has many electrical properties, being both photovoltaic, where light converts to increased illumination. Below its melting point, selenium is a p-type semiconductor.

Property Name Property Value Property Name Property Value
Atomic Code (34Se78.96) First Ionization Energy 225K-cal/g-mole
CAS # 7782-49-2 Electronegativity 2.4Pauling's
Covalent Radius 1.16Angstroms
Melting Point 217°C Mohs Hardness @ 20°C 2.0
Boiling Point 685°C Coefficient of Thermal Expansion 3.79x10-5K-1
Density (amorphous) 4.28g/cm3 Thermal Expansion 2.8-7.3ppm/°C
Themal Conductivity 7-18.3x10-4cal/cm2/cm/s/°C Electrical Resistivity 12µΩ-cm
Specific Heat @ 25°C 0.084cal/g°C Crystal Structure Hexagonal
Heat of Fusion 1.25k-cal/g-atom Volume Compressibility 12.2x10-5atm-1
Heat of Vaporization 3.34k-cal/g-atom Magnetic Susceptibility -0.32x10-6cgs
Atomic Volume 16.5W/D


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