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lanthanum    音標拼音: [l'ænθənəm]
n. 鑭

鑭

lanthanum
n 1: a white soft metallic element that tarnishes readily;
occurs in rare earth minerals and is usually classified as
a rare earth [synonym: {lanthanum}, {La}, {atomic number 57}]

Lanthanum \Lan"tha*num\ (l[a^]n"th[.a]*n[u^]m), n. [NL., fr. Gr.
lanqa`nein to lie hid, to be concealed.] (Chem.)
A rare element of the rare earth group of the metals, of
atomic number 57, allied to aluminum. 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 earth elements with which it is
usually associated. Atomic weight 138.9. Symbol La. [Formerly
written also {lanthanium}.]
[1913 Webster]

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  • Lanthanum - Wikipedia
    Lanthanum is a chemical element; it has symbol La and atomic number 57 It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air It is the first and the prototype of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table Lanthanum is traditionally counted among the rare-earth elements Like most other rare-earth
  • Lanthanum | Rare Earth Element, Uses in Technology, Medicine | Britannica
    Lanthanum, chemical element, a rare-earth metal of Group 3 of the periodic table, that is the prototype of the lanthanide series of elements
  • What Is Lanthanum Used For? From Kidneys to Batteries
    Lanthanum is a soft, silvery rare earth metal with a surprisingly wide range of practical uses, from medicine to camera lenses to petroleum refining Most people encounter it indirectly: in the glass of high-end optics, in rechargeable batteries, or as a prescription medication for kidney disease
  • Lanthanum - Element information, properties and uses | Periodic Table
    Lanthanum is an important component of mischmetal alloy (about 20%) The best-known use for this alloy is in ‘flints’ for cigarette lighters ‘Rare earth’ compounds containing lanthanum are used extensively in carbon lighting applications, such as studio lighting and cinema projection
  • Lanthanum Facts – Atomic Number 57 or Symbol La
    Get lanthanum facts Discover the properties, uses, sources, and health effects of the element with atomic number 57 and element symbol La
  • Lanthanum Facts, Symbol, Discovery, Properties, Uses
    Lanthanum (pronunciation: LAN-the-nem) [3] is a soft, silvery rare-earth metal belonging to the lanthanoids family and represented by the chemical symbol La [1, 2]
  • Comprehensive Guide to Lanthanum: Uses, Properties, and Applications
    Explore the comprehensive guide on Lanthanum, a rare-earth element with wide-ranging applications Learn about its history, physical and chemical properties, industrial uses in fluid catalytic cracking, optics, and green technologies, as well as its medical applications Understand its safety protocols and unique characteristics that make it essential in modern life
  • Periodic Table of Elements: Los Alamos National Laboratory
    Isotopes Natural lanthanum is a mixture of two stable isotopes, 138 La and 139 La Twenty three other radioactive isotopes are recognized Uses Rare-earth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection
  • Lanthanum: Properties and Applications - Stanford Materials
    Lanthanum, with its unique physical and chemical properties, has become a cornerstone in various industrial applications From catalysis and optics to electronics and medicine, the versatility of lanthanum continues to drive innovation and technological advancements
  • Lanthanum - New World Encyclopedia
    Lanthanum, its alloys, and its compounds have a wide range of applications For instance, the element is used in motion-picture studio illumination that relies on carbon-arc lighting, and it is a substitute for thorium in gas tungsten-arc welding electrodes It is an important component of mischmetal, a pyrophoric alloy used in lighter flints, and small amounts of this element may be added to





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