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