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holmiumColumbia Encyclopedia entry: holmium
Holmiumhōl'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 in Group 3 of the periodic table. 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, 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.
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Wikipedia search results for: Holmium
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Holmium 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 earth metal, it is found in the minerals monazite and gadolinite. Holmium has the highest magnetic strength of any element and therefore is used for the polepieces of the strongest static magnets. Because holmium can absorb nuclear fission-bred neutrons, it is also used in nuclear control rods and for components for electronic devices.
Holmium is a relatively soft and malleable element that is fairly...more »
Columbia Encyclopedia search results: holmium
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- Periodic Table of the Elements: Holmium
Periodic Table of the Elements: HolmiumAtomic Number:67Atomic Symbol:HoHolmiumAtomic Weight:164.9304ElectronConfiguration:2 · 8 · 1829 · 8 · 2
- Ho
Ho, symbol for the element holmium.
- 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 (a...
- Elements (table)
ElementsElementSymbolAtomic NumberAtomic Weight1Melting Point(Degrees Celsius)Boiling Point(Degrees Celsius)1 Parentheses indicate most stable isotope.actiniumAc89227.02781050.3200....
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