Define lanthanum
WebThe content of the individual rare-earth elements varies considerably from mineral to mineral and from deposit to deposit. The minerals and ores are generally classified as “light” or “heavy”; in the former group most of the elements present are the light-atomic-weight elements (i.e., lanthanum, cerium, praseodymium, neodymium, samarium, and … WebMay 3, 2024 · Lanthanides Definition. The lanthanides are generally considered to be elements with atomic numbers 58-71 ( lanthanum to lutetium ). The lanthanide series is the group of elements in which the 4f sublevel is being filled. All of these elements are metals (specifically, transition metals ). They share several common properties.
Define lanthanum
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WebMar 3, 2024 · rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] through lutetium [Lu]). The elements cerium through lutetium are called the …
Weblanthanum in American English. (ˈlænθənəm ) noun. a soft, malleable, silvery chemical element, one of the rare-earth elements and the first member of the lanthanide … WebMay 17, 2024 · Lanthanum is a transition element in Group 3 (IIIB) of the periodic table. Lanthanum's position makes it one of the transition metals. The transition metals are found in the center of the periodic table, in Groups 3 through 12. Lanthanum can also be classified as a rare earth element. The rare earth elements are the 15 elements that …
WebLanthanum carbonate, La 2 (C O 3) 3, is the salt formed by lanthanum(III) cations and carbonate anions. It is an ore of lanthanum metal (bastnäsite), along with monazite. Chemistry. Lanthanum carbonate is used as a starting material in lanthanum chemistry, particularly in forming mixed oxides, for example WebJul 20, 1998 · lanthanum (La), chemical element, a rare-earth metal of Group 3 of the periodic table, that is the prototype of the lanthanide …
WebMay 4, 2016 · lanthanum (n.) lanthanum. (n.) metallic rare earth element, 1841, coined in Modern Latin by Swedish chemist and mineralogist Carl Gustav Mosander (1797-1858), …
Weblanthanum: 1 n a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth Synonyms: La , atomic number 57 Type … miles and tish eyewearWebLanthanum is a silver-white metal. Word Origin mid 19th cent.: from Greek lanthanein ‘escape notice’ (because for a long time it was undetected in cerium oxide) + -um . Questions about grammar and vocabulary? miles and taylorWebDefinition and synonyms of lanthanum from the online English dictionary from Macmillan Education. This is the British English definition of lanthanum.View American English … miles and tisch eyecare nycWeblanthanide: [noun] any of the series of elements with increasing atomic numbers that begins with lanthanum or cerium and ends with lutetium — see Periodic Table. new york cheesecake vs regular cheesecakeWebLanthanum. definition. Lanthanum means (i) lanthanum; (ii) any isomers, salts, solvates, hydrates, polymorphs, esters, prodrugs, or metabolites of (i); and ( iii) any compound involving forming or breaking a bond or bonds with any of (i) or (ii) where at least one prophylactic, therapeutic or diagnostic indication of such compound and/or its ... new york cheesecake with sour creamWebChemical Characteristics. Lanthanum is a chemically reactive metal and is the most reactive element in the lanthanide series. It readily oxides when exposed to air to form an oxide and is slowly tarnished to lose its silvery appearance. It rapidly burns to from lanthanum oxide in air. Lanthanum reacts with sulfur, selenium, boron, phosphorus ... new york cheesecake with chocolate ganacheWebOrigin of Lanthanum New Latin from Greek lanthanein to escape notice (from the finding of the element hidden in oxide of cerium) From American Heritage Dictionary of the … miles an hour calculator