Selenium (Se)

Atomic Number: 34

Relative Atomic Mass: 78.96

Electronegativity: 2.55

Atomic Radius (Picometers): 115

Appearance: Black

Occurrence: Natural

Melting Point (Kelvin): 494

Boiling Point (Kelvin): 958

Stable Isotopes: 74, 76, 77, 78, 80

Discoverer: Jons Berzelius in 1817

Properties: Dense, Conducts Electricity

First Use: Unknown

Modern Uses: Glass, Rubber

Picture Courtesy of W. Oelen

©2011 Grant Dwyer