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holmium |
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holmium (hōl`mēəm) [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.9304; m.p. about 1,474°C;; b.p. about 2,425°C;; sp. gr. 8.78 at 25°C;; valence +3. Holmium is a soft, malleable, lustrous, silvery metal of the lanthanide series lanthanide series, a series of metallic elements, included in the rare-earth metals , in Group 3 of the periodic table . Members of the series are often called lanthanides, although lanthanum (atomic number 57) is not always considered a member of the series. ..... Click the link for more information. in Group 3 of the periodic table periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley . In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the ..... Click the link for more information. . It is prepared by reduction of a holmium halide with calcium metal. Holmium is stable in dry air at room temperature but is rapidly oxidized in moist air or when heated. Holmia, the oxide, is found in nature, with other rare earths rare earths, in chemistry, oxides of the rare-earth metals . They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they were once thought to be very scarce. ..... Click the link for more information. , in the minerals gadolinite and monazite. Holmium, its oxide, and its salts have no commercial uses. The metal was discovered spectroscopically in 1878 by the Swiss chemists Soret and Delafontaine and independently in 1879 by the Swedish chemist Per T. Cleve; it is named for Cleve's native city. holmium a malleable silver-white metallic element of the lanthanide series. Symbol: Ho; atomic no.: 67; atomic wt.: 164.93032; valency: 3; relative density: 8.795; melting pt.: 1474°C; boiling pt.: 2700°C holmium [′hōl·mē·əm] (chemistry) A rare-earth element belonging to the yttrium subgroup, symbol Ho, atomic number 67, atomic weight 164.9304, melting point 1400-1525°C. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Trimedyne recently received FDA clearance to market a new, Side Firing Laser Fiber for use with Holmium Lasers for their FDA cleared indications, including the treatment of benign prostatic hyperplasia or BPH, commonly referred to as an "enlarged prostate". sales organization elsewhere throughout the world for use with Lumenis' Holmium lasers for the treatment of enlarged prostates in men. throughout the rest of the world for use in conjunction with Lumenis' Holmium Lasers for holmium laser ablation of the prostate (HoLAP) in men. |
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