Amorphous red powder, becoming black on standing and crystalline on heating; vitreous and colloidal forms may be prepared.
Amorphous form softens at 40 °C and melts at 217 °C. It rarely occurs in its elemental state in nature, or as pure ore compounds.
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Symbol:
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Se
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CAS
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7782-49-2
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Atomic Number:
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34
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Atomic Weight:
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78.96
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Density:
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4.79 gm/cc
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Melting Point:
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217 oC
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Boiling Point:
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684.9 oC
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Thermal Conductivity:
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0.00519 W/cm/K @ 298.2 K
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Electrical Resistivity:
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106 microhm-cm @ 0 oC
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Electronegativity:
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2.4 Paulings
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Specific Heat:
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0.767 Cal/g/K @ 25 oC
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Heat of Vaporization:
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3.34 K-cal/gm atom at 684.9 oC
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Heat of Fusion:
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1.22 Cal/gm mole
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Brand
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Epoch-Chem
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1 Manufacturing:selenium(I) chlorid,Selenium dichloride,Selenides, mercury selenide.
2 Science high technology industry:lead selenide,zinc selenide, copper indium gallium diselenide.
3 Electric:semiconductors,electropositive metals,Tetraselenium tetranitride.
4 Chemistry:Selenols,selenium isotope,Plastics, photographic exposure.
5 Industry application:Glass making,selenium drum, electrostatic photograph,optical instrument.
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