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 ?
Many orthopedic surgeons are now learning to use Trimedyne's Holmium laser in this new, minimally invasive procedure that is usually performed on an outpatient basis under local anesthesia.
There are several advantages to holmium laser vaporization to the urethral tumour through a ureteroscope.
TURP: transurethral resection of the prostate; PVP: photoselective vaporization of the prostate; HoLAP: holmium laser ablation of the prostate; HoLEP: holmium laser enucleation of the prostate; HoLRP: holmium laser resection of the prostate; TUMT: transurethral microwave thermotherapy; TUNA: transurethral needle ablation.
Current Opinion in Urology, Holmium laser treatment of benign prostatic hyperplaisa: an update
Trimedyne manufactures proprietary Holmium lasers and patented fiber optic laser devices for a variety of minimally invasive surgical procedures, many of which are performed on an outpatient basis at substantially less cost than conventional surgery.
The high power holmium laser is a versatile tool that every urology department should have, and is an essential tool in my OR.
A randomised trial comparing holmium laser enucleation versus transurethral resection in the treatment of prostates larger than 40 grams: results at 2 years.
Peter Gilling (New Zealand) will lecture on and perform a live HoLEP(TM) holmium enucleation of the prostate procedure.
The DuraMax fiber vaporizes an average of 3 to 4 grams of soft tissue per minute in the lab and lasts longer than required to treat a normal size prostate using 80 to 100 watts of holmium laser energy.
Further developments include interstitial laser coagulation of the prostate and holmium laser prostate enucleation and (HoLEP), holmium laser ablation of the prostate (HoLAP), which remain in use.
I am also capable of performing a Holmium laser enucleation of the prostate (HoLEP).