cerium

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cerium

(sēr`ēəm) [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799°C;; b.p. 3,426°C;; sp. gr. 6.77 at 25°C;; valence +3 or +4. Cerium is a soft, malleable, ductile, iron-grey metal with hexagonal or cubic crystalline structure. It is slightly harder than lead. It is the most abundant of the rare-earth metalsrare-earth metals,
in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, which is not found in nature, is not usually considered a rare-earth metal.
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 of 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 does not tarnish rapidly in dry air but quickly loses its luster in moist air. It oxidizes slowly in cold water and rapidly in hot water. It is attacked by solutions of alkalis and by concentrated or dilute acids. When heated it burns with a brilliant flame to form the oxide (ceria) that exhibits incandescence and is used in making lamp mantles (see Welsbach mantleWelsbach mantle
or Welsbach burner
[for C. A. von Welsbach], cylindrical framework of gauze impregnated with oxides of thorium and cerium. When heated in a gas flame, it produces a very bright light because of the incandescence of the oxides.
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). The metal is used as a core for the carbon electrodes of arc lamps. The element forms alloys with other metals. An alloy of cerium and iron is used as the flint in cigarette and gas lighters. Minute particles of this alloy ignite in the air when scratched from the surface of the larger mass. Cerium is prepared by electrolysis of the chloride or by reduction of the fused fluoride with calcium. Cerium was recognized in 1803 in the oxide (ceria) as a new metal by M. H. Klaproth and by J. J. Berzelius and Wilhelm Hisinger; it was named for the asteroid Ceres, which had been discovered only two years earlier. The metal was obtained in a very impure state by C. G. Mosander and by Friedrich Wöhler some thirty years later; the nearly pure metal was not obtained until 1875 by W. F. Hillebrand and T. H. Norton.

Cerium

 

Ce, a chemical element. Atomic number, 58; atomic weight, 140.12. A rare-earth element, cerium is one of the lanthanides.

cerium

[′sir·ē·əm]
(chemistry)
A chemical element, symbol Ce, atomic number 58, atomic weight 140.12; a rare-earth metal, used as a getter in the metal industry, as an opacifier and polisher in the glass industry, in Welsbach gas mantles, in cored carbon arcs, and as a liquid-liquid extraction agent to remove fission products from spent uranium fuel.

cerium

a malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no.: 58; atomic wt.: 140.115; valency: 3 or 4; relative density: 6.770; melting pt.: 798°C; boiling pt.: 3443°C
References in periodicals archive ?
Anita CERIC is a Professor at the Department of Construction Management and Economics at the Faculty of Civil Engineering at the University of Zagreb.
The adviser to HM the King takes this occasion to pay tribute to Ceric, "a fellow traveler and a longtime friend whose voice has always been that of light and reason", and the community of Sant'Egidio "which has always been at the forefront in helping to resolve the most acute conflicts.
Duke and coworkers have shown that ceric salts form complexes with alcohols, and these complexes are disproportionate via single electron transfer with the formation of free radicals on the reducing agent.
In this paper both personalities are analyzed as opinion leaders who, within certain contexts, are regarded as undoubted authorities--Dodik as political and Ceric as spiritual--and as guardians and interpretators of the national or religious interests of their own group.
Some who opposed the mosque have driven by yelling obscenities or giving congregants the finger while others have left hate-filled messages on the mosque's answering machine, according to Ceric.
Handelsbanken expects that ceric ammonium nitrate (CAN) prices for the new season will start below EUR150 per tonne against the current EUR196 per tonne.
The conference was convened by the archbishop of Canterbury and jointly hosted by an interreligious body consisting of Mustafa Ceric, the Rais al-Ulama of the Muslim community of Bosnia and Herzegovina, Metropolitan Nikolaj of the Serbian Orthodox Diocese of Dabar-Bosnia, and Cardinal Vilko Puljic, the Roman Catholic archbishop of Sarajevo.
Mustafa Ceric and renowned sheikhs Abdallah Ibn Bayyah and Habib Ali al-Jifri were among the speakers at the academically minded "Mardin: The Abode of Peace" summit held at Artuklu University.
Ceric replies to the question whether "Muslims from Jeddah are closer to the identity of Bosniacs in Sarajevo (11) or Serbs from Banja Luka" in the following way: "Well, you see, how someone who was killing me, who raped my sister can be close to me" (12).
Aqueous solution of ceric ammonium nitrate is mixed with the product, red colour is appeared, which indicate the presence of diol.
After introductory remarks by Cardinal Jean-Louis Tauran and Mustafa Ceric, the Bosnian Grand Mufti, a Catholic and a Muslim scholar delivered lectures on how theirfaiths understand the concept of love of God.
The Grand Mufti of Bosnia, Mustafa Ceric, chastised the entire crowd for turning Jerusalem, a city they all consider holy, into a place of strife and controversy.