Selenium (Se)

Selenium (Se)

Amorphous selenium ([Ar]3d104s24p4) (CAS 7782-49-2) 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.

Reactive Nonmetal Salts >

Phase at STP: Solid

Common Oxidation States: +4, -2, +6

Number of Valence Electrons: 6

Electronegativity (Pauling): 2.4

First Ionization Energy: 225 kcal/mole

Covalent Radius: 1.16 Angstroms

Melting Point: 217°C

Boiling Point: 685°C

Density: 4.28 g/cm3

Crystal Structure: Hexagonal

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Selenium ingot/button,≈38mm (1.5 in.) dia., Thermo Scientific™ Thermo Scientific™

This Thermo Scientific brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific.