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La (Lanthanum)

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Keterangan

      Lanthanum is one of the most reactive of the 'rare earth' metals. It oxidises rapidly when exposed to the air, and burns easily. It is attacked slowly by cold water, and rapidly by hot water. It reacts directly with carbon, nitrogen, phosphorus, sulfur, the halogens and some other elements. At room temperature, the structure of lanthanum is hexagonal. This changes to face-centred cubic at 310K, and to body-centred cubic at 865K.

Nama lain (trademark, branding etc.)

Lanthanium, Lanthan, Lantan, Lanthane, Lanthan - r, Lantanio, Лантан

Spesifikasi Produk

Overview of Lanthanum
Atomic Number 57
Group 3
Period 6
Series Lanthanides
Relative Atomic Mass (12C=12.000)   138.91
Boiling Point 3730K 3457°C 6255°F
Melting Point 1193K 920°C 1688°F
Density/kg m-3  6145 (298K)
Ground State Electron Configuration  [Xe]5d16s2
Electron Affinity(M-M-)/kJ mol-1  -53
Discoverer C.G. Mosander
Discovery Location Stockholm, Sweden.
Discovery Year:  1839
Name Origin: Greek: lanthanein (to lie hidden).

Aplikasi

     Because it gives glass refractive properties, it is used in expensive camera lenses. Also used in lighter flints, battery electrodes and catalytic converters.

Bahan Baku

Lanthanum is a chemical element with the symbol La and atomic number 57. Lanthanum is a silvery white metallic element that belongs to group 3 of the periodic table and is the first element of the lanthanide series. It is found in some rare-earth minerals, usually in combination with cerium and other rare earth elements. Lanthanum is a malleable, ductile, and soft metal that oxidizes rapidly when exposed to air. It is produced from the minerals monazite and bastnäsite using a complex multistage extraction process. Lanthanum compounds have numerous applications as catalysts, additives in glass, carbon lighting for studio lighting and projection, ignition elements in lighters and torches, electron cathodes, scintillators, and others.

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