Name :  Lanthanum
Symbol :  La
Atomic Number :  57
Atomic Weight :  138.9055
Specific Heat :  0.19 J/gK
Melting Point :  918°C
Vaporization :  414.0 kJ/mol
Boiling Point :  3464°C
Electronegativity :  1.1
Density@293 K :  6.7 g/cm³
Discovered :  Carl Mosander, Sweden, 1839
Description :  Soft, silvery-white, malleable, ductile metal.
Uses :  It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses.