Promethium (Pm)

Atomic Number: 61

Relative Atomic Mass: About 145

Electronegativity: 1.13

Atomic Radius (Picometers): 185

Appearance: Metallic

Occurrence: Decay

Melting Point (Kelvin): 1315

Boiling Point (Kelvin): 3273

Stable Isotopes: None

Discoverers: Chien-Shiung Wu, Emilio Segre and Hans Bethe in 1942

Properties: Radioactive

First Use: Unknown

Modern Uses: Light Source, Atomic Battery

Picture Courtesy of images-of-elements.com

©2011 Grant Dwyer