yttria group of rare earths

См. также в других словарях:

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• Yttrium — (pronEng|ˈɪtriəm) is a chemical element with symbol Y and atomic number 39. It is a silvery metallic transition metal chemically similar to the lanthanoids and has historically been classified as a rare earth element. Yttrium is almost always… …   Wikipedia

• Yttrium — Strontium ← Yttrium → Zirconium Sc …   Wikipédia en Français

• Timeline of chemical elements discoveries — The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element,[clarification needed] as the exact date of discovery… …   Wikipedia

• Ytterbium — Yb redirects here. For the unit of information, see Yottabit. thulium ← ytterbium → lutetium ↑ Yb ↓ No …   Wikipedia

• Lanthanoid — The lanthanoid (according to IUPAC terminology) (previously lanthanide) series comprises the 15 elements with atomic numbers 57 through 71, from lanthanum to lutetium. [ [http://www.iupac.org/reports/periodic table IUPAC Periodic Table] ] [ [http …   Wikipedia

• yttrium — yttric, adj. /i tree euhm/, n. Chem. a rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y; at. wt.: 88.905; at. no.: 39; sp. gr.: 4.47. Cf. rare earth element. [1815 25; < NL, named after Ytterby. See YTTERBIA,… …   Universalium

• Samarium — promethium ← samarium → europium ↑ Sm ↓ …   Wikipedia

• cerium — /sear ee euhm/, n. a steel gray, ductile metallic element of the rare earth group found only in combination. Symbol: Ce; at. wt.: 140.12; at. no.: 58. [1795 1805; CER(ES) + IUM] * * * Chemical element, a rare earth metal of the lanthanide series… …   Universalium