| Name:
Selenium
Acid-Base Properties: Strongly Acidic Atomic Number: 34 Atomic Radius: 1.22 Angstrom Atomic Symbol: Se Atomic Volume: 16.45 cc/mole Boiling Point: 958 K Covalent Radius: 1.16 Angstrom Crystal Structure: Hexagonal Density: 4.8 g/cc at 300 K Electrical Conductivity: 0 Mmho/cm Electron Configuration: [Ar] 3d10 4s2p4 First Ionization Potential: 9.75 V Heat of Fusion: 6.69 kJ/mole Heat of Vaporization: 37.7 kJ/mole Melting Point: 494 K Natural State: Solid Oxidation States: -2,4,6 Pauling Electronegativity: 2.55 Specific Heat Capacity: 0.32 J/g-K Thermal Conductivity: 0.02 W/cm-K Weight: 78.96 g/mole |
| History: Discovered by berzelius in 1817, who found it associated with tellurium, named for the earth selenium is found in a few rare minerals such as crooksite and clausthalite. |