holmium


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holmium

(hōl`mēəm) [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.93032; 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 serieslanthanide 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.
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 in Group 3 of the periodic tableperiodic 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 table entitled
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. 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 earthsrare 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.
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, 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

[′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.

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
References in periodicals archive ?
A randomised trial comparing holmium laser enucleation versus transurethral resection in the treatment of prostates larger than 40 grams: results at 2 years.
The operation used diode laser has such advantages as little bleeding, quick recovery, short hospital stay, few complications, and more.[31],[32] The straight light and lateral light of the 1470 nm diode laser make the operation process more easier compared with those of Holmium:YAG laser and 2 [micro]m CW laser.
Cromeens, "Endoscopic laser fragmentation of ureteral calculi using the holmium:YAG," Proceedings of SPIE, vol.
A major advantage of the holmium laser is that it is capable of delivering energy to the target tissue through air, saline, or blood.
Direct cholangioscopy-based holmium laser lithotripsy of difficult bile duct stones by using an ultrathin upper endoscope without a separate biliary irrigating catheter.
The mean operative time was, respectively, 56 minutes for the use of a pneumatic lithotripter and 34 minutes for the use of a holmium laser (p - 0.04) (Table 4).
The pneumatic and holmium: yttrium- aluminum-garnet laser lithotripsy both are established choices for treatment of ureteral stone but in terms of greater stone clearance rate and decrease incidence of proximal stone migration HO: YAG lithotripsy is better than pneumatic lithotripsy.
Nickel acetate [Ni(OCOCH3)2*4H2O; 99%] and holmium nitrate [Ho(NO3)3*5H2O; 99%] (obtained from Sigma- Aldrich(r)) were used as Ni-metal and Ho-promoter precursors respectively.
The US Food and Drug Administration (FDA) approved NS3000, marketed under the name StoneLight 30, which is Syneron Medical's surgical laser device that uses the Holmium wavelength to shatter kidney stones in a minimally invasive manner via a laproscopic or endoscopic procedure.
As it can be seen from the Figure 1, it is impossible to explain the accumulation of neodymium, terbium, and holmium in hydrocarbon media manifested through the differentiated positive anomalies of the lanthanides in the REE composition merely by their trivalent state in geochemical processes.
Alti hastada intrayezikal sling materyali antegrad olarak suprapubik bolgeden girilip sistos-kopla goruntulenmis, sling uzerindeki enkrustasyonlar holmium laserle kirilmistir.