bn:00049950n
Noun Concept
Categories: long volume value, Sets of chemical elements, Metallic elements, Articles with short description, Rare earth elements
EN
rare earth  rare-earth element  lanthanoid  lanthanide  lanthanon
EN
Definitions
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EN
The rare-earth elements, also called the rare-earth metals or rare earths or, in context, rare-earth oxides, and sometimes the lanthanides, are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Wikipedia
The lanthanide or lanthanoid series of chemical elements comprises the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium. Wikipedia
Trivalent metallic rare earth elements Wikidata
Any of the fifteen lanthanides plus scandium and yttrium Wikidata
Any of the 15 chemical elements from lanthanum (atomic number 57) to lutetium (atomic number 71) with very similar chemistry. OmegaWiki
Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides. Wiktionary
Any of the 14 rare earth elements. Wiktionary (translation)
Lanthanide. Wiktionary
Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium. Wiktionary
Type of metal. Wiktionary (translation)
Rare earth element. Wiktionary