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The Element Lanthanum

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Definition of the Lanthanum Element
A soft, silvery-white, malleable, ductile, metallic rare-earth element, obtained chiefly from monazite and bastnaesite and used in glass manufacture and with other rare earths in Carbon lights for movie and television studio lighting. Lanthanum oxidizes rapidly in air and it reacts with water to form the hydroxide. The Atomic Number of this element is 57 and the Element Symbol is La.

The Properties of the Lanthanum Element
Symbol of Element : La
Atomic Number : 57
Atomic Mass: 138.9055 amu
Melting Point: 920.0 C - 1193.15 K
Boiling Point: 3469.0 C - 3742.15 K
Number of Protons/Electrons : 57
Number of Neutrons : 82
Crystal Structure: Hexagonal
Density @ 293 K: 6.7 g/cm3

Origin / Meaning of the name Lanthanum
The name originates from the Greek word lanthanein meaning 'to lie hidden' because it hid in cerium ore and was difficult to separate from that rare earth mineral.

Periodic Table Group and Classification of the of the Lanthanum Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Lanthanum classified as an element in the Lanthanide series as one of the "Rare Earth Elements" which can located in Group 3 elements of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are divided into the Lanthanide and Actinide series. The elements in the Lanthanide series closely resemble lanthanum, and one another, in their chemical and physical properties. Their compounds are used as catalysts in the production of petroleum and synthetic products. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

Facts about the Discovery and History of the Lanthanum Element
Lanthanum was discovered by Carl G. Mosander in 1839

Occurrence of the Lanthanum Element
Obtained chiefly from monazite and bastnaesite

Abundances of the element in different environments
% in Universe 210-7%
% in Sun 210-7%
% in Meteorites 0.000028%
% in Earth's Crust 0.0034%
% in Oceans 3.410-10%
% in Humans N/A

Associated Uses of Lanthanum
Glass manufacture
Carbon lights for movie and television studio lighting
Camera lenses

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