Definition of Lanthanum. Meaning of Lanthanum. Synonyms of Lanthanum

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Definition of Lanthanum

Lanthanum
Lanthanum Lan"tha*num, n. [NL., fr. Gr. ? to lie hid, to be concealed.] (Chem.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La. [Formerly written also lanthanium.]

Meaning of Lanthanum from wikipedia

- Lanthanum is a chemical element with the symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed...
- comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium. These elements, along with the chemically similar elements...
- Lanthanum oxide, also known as lanthana, chemical formula La2O3, is an inorganic compound containing the rare earth element lanthanum and oxygen. It is...
- Naturally occurring lanthanum (57La) is composed of one stable (139La) and one radioactive (138La) isotope, with the stable isotope, 139La, being the...
- Lanthanum hexaboride (LaB6, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material...
- Lanthanum carbonate, La2(C O3)3, is the salt formed by lanthanum(III) cations and carbonate anions. It is an ore of lanthanum metal (bastnäsite), along...
- Lanthanum(III) nitrate is a water soluble salt of lanthanum. It decomposes at 499°C to lanthanum oxide, nitric oxide and oxygen. It is a starting chemical...
- Lanthanum hydroxide is La(OH) 3, a hydroxide of the rare-earth element lanthanum. Lanthanum hydroxide can be obtained by adding an alkali such as ammonia...
- lutetium. None of them have any biological role. Historically, sometimes lanthanum (La) and actinium (Ac) were included in the group instead of lutetium...
- Lanthanum chloride is the inorganic compound with the formula LaCl3. It is a common salt of lanthanum which is mainly used in research. It is a white...