Medical Definition rare earth element noun : any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium called also rare earth metal ...
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Define rare-earth element. rare-earth element synonyms, rare-earth element pronunciation, rare-earth element translation, English dictionary definition of rare-earth element. n. Any of a group of 17 naturally occurring metallic elements that have similar
a natural habitat, sphere of activity, environment, etc.: to be in one's element; Water is the element of fish. elements, atmospheric agencies or forces; weather: a ruddy complexion from exposure to the elements. the rudimentary principles of an art, science, etc.: ...
Element Definition noun plural: elements el‧e‧ment, ˈel.ɪ.mənt (biochemistry) A substance that cannot be decomposed into simpler substances by chemical means, and is made up of atoms all with an identical number of protons ...
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The REE is generally subdivided into lightrare earth elements(LREE) and heavy rare earth elements (HREE), although their definition might differ from author to author.IUPAC (2005)states that LREE is the lanthanides that have unpaired electrons ranging from 0 to 7 in the 4f orbital (fromLato ...
although it is classified among the minorconstituentsofEarth’s crust, in which its proportion is estimated to be between 0.03 and 0.06 percent. On the basis of the finding that certainmeteoritescontain about 12 percent sulfur, it has been suggested that deeper layers of Earth contain a much la...
Science Chemistry periodic table chemistry Ask the Chatbot a Question More Actions Also known as: periodic table of the elements Written by Linus C. Pauling, J.J. Lagowski•All Fact-checked by The Editors of Encyclopaedia Britannica Article History In full: periodic table of the ...
Learn about the element plutonium. Understand plutonium's definition, uses, how and when it was discovered, properties such as atomic number, and...