Lanthanum is a soft, ductile, white metal which oxidises rapidly in air. It is one of the most reactive of the lanthanide group of elements, reacting with water to produce hydrogen gas. At very low temperatures, lanthanum is super conducting (at 6K). It is used to manufacture special grades of optical glass which have specific refractive properties.


1839 by C.G. Mosander in Stockholm, Sweden.

32 ppm of the Earth's crust.

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Atomic number 57 Clip
Atomic / Molecular Weight 138.9055 gmol-1Clip
Density 6174 kgm-3Clip
Crystal Structure hcp / fcc at 583K then fcc / bcc at 1137K Clip
Lattice constant 377 fmClip
Melting Point 1193 KClip
Boiling Point 3703 KClip
Specific heat capacity 201 Jkg-1K-1Clip
Thermal conductivity 13 Wm-1K-1Clip
Electromotive Series 2.37 VClip
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See also: Lanthanum Carbide, Lanthanum Carbonate, Lanthanum Gallium Silicate, Lanthanum Hexaboride, Lanthanum III Bromide, Lanthanum III Chloride, Lanthanum III Oxide, Lanthanum Strontium Cobalt Ferrite, Lanthanum Strontium Manganite, Periodic Table.

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Subjects: Chemistry