Caesium (Cs)

Atomic Number: 55

Relative Atomic Mass: 132.90545192

Electronegativity: 0.79

Atomic Radius (Picometers): 260

Appearance: Silver-Gold

Occurrence: Natural

Melting Point (Kelvin): 301.59

Boiling Point (Kelvin): 944

Stable Isotopes: 133

Discoverer: Robert Bunsen in 1860

Properties: Soft, Ductile

First Use: Chemical and Electric Fields (Unknown)

Modern Uses: Atomic Clock, Centrifugation Fluids

Picture Courtesy of Dnn87

©2011 Grant Dwyer