Lanthanum (La)

Atomic Number: 57

Relative Atomic Mass: 138.90547

Electronegativity: 1.10

Atomic Radius (Picometers): 195

Appearance: Silver-White

Occurrence: Natural

Melting Point (Kelvin): 1193

Boiling Point (Kelvin): 3737

Stable Isotopes: 139

Discoverer: Carl Mosander in 1838

Properties: Malleable, Soft, Ductile

First Use: Gas Lanterns (1885)

Modern Uses: Batteries, Vacuum Tubes

Picture Courtesy of Jurii

©2011 Grant Dwyer