1) Atomic number 57 2) Chemical element 3) Element discovered in 1839 4) Element number 57 5) Element with the symbol La 6) Metal 7) Metallic element 8) Reducing agent
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1) La
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Lanthanum is a chemical element with the symbol La and atomic number 57. Lanthanum is a silvery white metallic element and is the first element of the lanthanide series (or, on occasion, considered the first element of the 6th-period transition metals). It is found in some rare-earth minerals, usually in combination with cerium and other rare eart...
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http://en.wikipedia.org/wiki/Lanthanum
• (n.) 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.Lanthanum: words in the d...
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(La), chemical element, rare-earth metal of transition Group IIIb of the periodic table, prototype of the lanthanoid series of elements. Lanthanum is ... [4 related articles]
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http://www.britannica.com/eb/a-z/l/15
(La) A silver-white metallic element of the lanthanide series, first identified by C. G. Mosander in Stockholm in 1839; its name comes from the Latin lanthana meaning 'to lie hidden.' Its chief ores are monazite and bastnaesite. Soft, malleable, and ductile, lanthanum ...
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<chemical> Lanthanum salts are used as a negative stain in electron microscopy and as calcium channel blockers. ... (18 Nov 1997) ...
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(La) (lan´thә-nәm) a chemical element, atomic number 57, atomic weight 138.91.
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Lanthanum salts are used as a negative stain in electron microscopy, and as calcium-channel blockers.
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Lan'tha·num (-nŭm)
noun [ New Latin , from Greek
lanqa`nein to lie hid, to be concealed.]
(Chemistry) 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 difficul...
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http://www.encyclo.co.uk/webster/L/12
(La) Type: Term Pronunciation: lan′thă-nŭm Definitions: 1. A metallic element, atomic no. 57, atomic wt. 138.9055; first of the rare earth elements (lanthanides).
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Lanthanum is a rare metal lanthanide element with the symbol La. It was discovered in the oxide of cerium by Mosander in 1839.
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[
n] - a white soft metallic element that tarnishes readily
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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...
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La noun a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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Soft, silvery, ductile and malleable, metallic element, atomic number 57, relative atomic mass 138.91, the first of the lanthanide series. It is used in making alloys. It was named in 1839 by Swedish chemist Carl Mosander (1797–1858)
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