Praseodymium (Pr)

Atomic Number: 59

Relative Atomic Mass: 140.90765

Electronegativity: 1.13

Atomic Radius (Picometers): 185

Appearance: Grey-White

Occurrence: Natural

Melting Point (Kelvin): 1208

Boiling Point (Kelvin): 3793

Stable Isotopes: 141

Discoverers: Carl Auer von Welsbach in 1885

Properties: Soft, Ductile, Malleable

First Use: Glass Colourisation (1920s)

Modern Uses: Aircraft Engines, Fire Starters

Picture Courtesy of Jurii

©2011 Grant Dwyer