Lanthanum

Lanthanum
Properties
Atomic symbol	La
Atomic number	57
Classification	Transition Metals
Atomic mass	138.9055 amu
Other Information
Date of discovery	1839
Name of discoverer	Carl Mosander
Name origin	From the Greek lanthanein, meaning to lie hidden.
Uses	Due to the refractive properties it adds to glass, it is used in expensive camera lenses. Also used in lighter flints, battery electrodes and catalytic converters.
Obtained from	Found along with monazite and bastnasite.