The Element Lanthanum

Although Lanthanum belongs to chemical elements group called rare earth metals, it is not rare at all since it is available in relatively large volumes. Lanthanum can be found in Monazite and Bastnasite up to 25 to 38 percent of the volume and richer in the latter mineral. The main Lanthanum producers are the Unites States, Africa, and China.

Lanthanum is used widely for the lighting solutions such as lighting used in studios for movies. It is also used for making special kinds of glasses such as infrared absorbing glasses, and camera and telescope lenses.

 


Atomic Number & Chemical Properties


Element Basics:

Chemical Symbol: La
Atomic Number: 57
Atomic Weight: 138.9055
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: Carl Mosander
Date of Discovery: 1839 (Sweden)
Origin of Name: Greek: lanthanein (to be hidden).

How to Recognize it at a Party:

Silvery-white, soft, malleable, and ductile metal

Seriously Atomic Information:

Density (g/cc): 6.15
Melting Point (°K): 1194
Boiling Point (°K): 3730
Atomic Radius (pm): 187
Atomic Volume (cc/mol): 22.5
Covalent Radius (pm): 169
Ionic Radius: 101.6 (+3e)
Pauling Negativity Number: 1.10
First Ionizing Energy (kJ/mol): 541.1
Oxidation States: 3
Electronic Configuration: [Xe] 5d1 6s2

Getting Intimate with Lanthanum:

Lattice Structure: Hexagonal (HEX)
Lattice Constant (Å): 3.750
Lattice C/A Ratio: 1.619
Specific Heat (@20°C J/g mol): 0.197
Fusion Heat (kJ/mol): 8.5
Evaporation Heat (kJ/mol): 402
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): 132.00


Society's Questions About Lanthanum:

Have you ever wondered what everyone else in the world thinks about Lanthanum? Is anyone else looking for it too? If so, why? What do they want?

The following list shows the most common online questions about the element Lanthanum. Are your questions the same or different from everyone else's?

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