dysprosium
dysprosium
Symbol: Dy
Atomic number: 66
Atomic weight: 162.50
Metallic with a bright silvery-white lustre. Dysprosium belongs to the lanthanoids. It is relatively stable in air at room temperatures, it will however dissolve in mineral acids, evolving hydrogen. It is found in from rare-earth minerals. There are seven natural isotopes of dysprosium, and eight radioisotopes, Dy-154 being the most stable with a half-life of 3*10^6 years. Dysprosium is used as a neutron absorber in nuclear fission reactions, and in compact disks. It was discovered by Paul Emile Lecoq de Boisbaudran in 1886 in France. Its name comes from the Greek word dysprositos, which means hard to obtain.

Elements of periodic system. 2013.

  • Dysprosium — (pronEng|dɪsˈproʊziəm) is a chemical element with the symbol Dy and atomic number 66. Characteristics Dysprosium is a rare earth element that has a metallic, bright silver luster, relatively stable in air at room temperature, but dissolving… …   Wikipedia

  • Dysprosium — Terbium ← Dysprosium → Holmium …   Wikipédia en Français

  • dysprosium — [ disprozjɔm ] n. m. • 1886; gr. dusprositos « difficile à atteindre » ♦ Chim. Élément atomique (Dy; no at. 66; m. at. 162,5), métal du groupe des terres rares d éclat métallique analogue à celui de l argent. ● dysprosium nom masculin (grec… …   Encyclopédie Universelle

  • Dysprosium — Dys*pro si*um, n. [NL., fr. Gr. dyspro sitos hard to get at.] (Chem.) An element of the rare earth group. Symbol Dy; at. wt., 162.5. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • dysprosium — element, obtained 1906 from an earth discovered in 1886, the last to be extracted from the complex earth called yttria, and named dysprosia in reference to the difficulty of obtaining it, from Gk. dysprositos hard to get at, difficult of access,… …   Etymology dictionary

  • dysprosium — [dis prō′zē əm, dis prō′sēəm] n. [ModL < Gr dysprositos, difficult of access < dys , DYS + prositos, approachable < prosienai, come to < pros, toward + ienai, to go (see ION): so named (1886) by its discoverer, Fr chemist P. E. Lecoq… …   English World dictionary

  • Dysprosium — Eigenschaften …   Deutsch Wikipedia

  • Dysprosium — Dys|pro|si|um 〈n.; s; unz.; chem. 〉 chem. Element, Metall der seltenen Erden [zu grch. dysprositos „schwer zu erlangen“] * * * Dys|pro|si|um [griech. dysprósitos = schwer zugänglich; ↑ ium (1)], das; s; Symbol: Dy; chem. Element, Protonenzahl 66 …   Universal-Lexikon

  • dysprosium — /dis proh see euhm, shee /, n. Chem. a rare earth metallic element, highly reactive and paramagnetic, found in small amounts in various rare earth minerals, as euxenite and monazite: used to absorb neutrons in nuclear reactors. Symbol: Dy; at. wt …   Universalium

  • Dysprosium — disprozis statusas T sritis fizika atitikmenys: angl. dysprosium vok. Dysprosium, n rus. диспрозий, m pranc. dysprosium, m …   Fizikos terminų žodynas