Erbium (Er)

Atomic Number: 68

Relative Atomic Mass: 167.259

Electronegativity: 1.24

Atomic Radius (Picometers): 175

Appearance: Silver-White

Occurrence: Natural

Melting Point (Kelvin): 1802

Boiling Point (Kelvin): 3141

Stable Isotopes: 162, 164, 166, 167, 168, 170

Discoverer: Carl Mosander in 1842

Properties: Malleable, Soft

First Use: Colour Glass (1990's)

Modern Uses: Control Rods, Cryocoolers

Picture Courtesy of Tomihahndorf

©2011 Grant Dwyer