holmium
holmium
Symbol: Ho
Atomic number: 67
Atomic weight: 167.26
Relatively soft and malleable silvery-white metallic element, which is stable in dry air at room temperature. It oxidizes in moist air and at high temperatures. It belongs to the lanthanoids. A rare-earth metal, it is found in the minerals monazite and gadolinite. It possesses unusual magnetic properties. One natural isotope, Ho-165 exists, six radioisotopes exist, the most stable being Ho-163 with a half-life of 4570 years. Holmium is used in some metal alloys, it is also said to stimulate the metabolism. Discovered by Per Theodor Cleve and J.L. Soret in Switzerland in 1879. The name homium comes from the Greek word Holmia which means Sweden. While all holmium compounds should be considered highly toxic, initial evidence seems to indicate that they do not pose much danger. The metal's dust however, is a fire hazard.

Elements of periodic system. 2013.

  • Holmium — (pronEng|ˈhoʊlmiəm) is a chemical element with the symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a relatively soft and malleable silvery white metallic element, which is stable in dry air at room temperature. A rare… …   Wikipedia

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

  • holmium — [ ɔlmjɔm ] n. m. • 1880; de (Stock)holm et suff. ium ♦ Chim. Élément atomique (Ho; no at. 67; m. at. 164,93), métal du groupe des terres rares. ● holmium nom masculin (de Stockholm) Métal du groupe des terres rares. (Élément de symbole Ho, l… …   Encyclopédie Universelle

  • HOLMIUM — urbs Boeotiae. Eius meminit Hesiod. initio Theogoniae, sed ut fluvii, non civitatis, v. 6. Η῍ Ι῾πποκρην´ης, ἢ Ο᾿λμειοῦ ζαθέοιο. Aut in Hippocrene, aut in Olimio sacro. Strab. l. 9. p. 407. auctor est. Permessum autem et Holmium, seu fontes, seu… …   Hofmann J. Lexicon universale

  • holmium — rare earth element, named by French chemist Lecoq de Boisbaudran (1838 1912) in 1886, from holmia holmium oxide, a Modern Latin word coined by the earth s discoverer, Swedish chemist Per Teodor Cleve (1840 1905), in 1879 from Holmia, Latin name… …   Etymology dictionary

  • Holmium — Hol mi*um, n. [NL., from Stockholm.] (Chem.) A rare element of atomic number 67 said to be contained in gadolinite. Chemical symbol Ho. Atomic weight 164.93. Valence +3. It was detected by spectral absorption bands in 1878 by the Delafontaine and …   The Collaborative International Dictionary of English

  • Holmĭum — Holmĭum, Ho, ein unsicheres chemisches Element, dessen Oxyd aus Erbinerde abgeschieden wurde …   Meyers Großes Konversations-Lexikon

  • holmium — [hōl′mē əm] n. [ModL < earlier holmia, so named (1879) by P. T. Cleve (see CLEVEITE), its second discoverer (first was L. Soret, Fr chemist, in 1878), after Holmia, Latinized name of STOCKHOLM, his native city + IUM] a trivalent, silvery… …   English World dictionary

  • Holmium — Eigenschaften …   Deutsch Wikipedia

  • holmium — /hohl mee euhm/, n. Chem. a rare earth, trivalent element found in gadolinite. Symbol: Ho; at. wt.: 164.930; at. no.: 67. [ < NL (1879), equiv. to Holm(ia) Stockholm + ium IUM] * * * ▪ chemical element  (Ho), chemical element, rare earth metal of …   Universalium