Lanthanum

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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.