cerium

ce·ri·um

C0212700 (sîr′ē-əm)n. Symbol Ce A lustrous, iron-gray, malleable metallic element of the lanthanide series that occurs chiefly in the minerals monazite and bastnaesite, exists in four allotropic states, is a constituent of pyrophoric alloys, and is used in metallurgy and in the manufacture of glass, incandescent mantles, and hydrocarbon combustion catalysts. Atomic number 58; atomic weight 140.12; melting point 799°C; boiling point 3,443°C; specific gravity 6.77; valence 3, 4. See Periodic Table.

[Cer(es) + -ium.]

cerium

(ˈsɪərɪəm) n (Elements & Compounds) 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[C19: New Latin, from Ceres (the asteroid) + -ium]

ce•ri•um

(ˈsɪər i əm)

n. a steel-gray, ductile metallic element of the rare-earth group found only in combination. Symbol: Ce; at. wt.: 140.12; at. no.: 58. [1795–1805; Cer (es) + -ium²]

ce·ri·um

(sîr′ē-əm) Symbol Ce A shiny, gray metallic element of the lanthanide series. It is easily shaped and in pure form will ignite if scratched with a knife. It is used in glass polishing and as a catalyst in self-cleaning ovens. Atomic number 58. See Periodic Table.

Thesaurus

Noun

cerium - a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth groupatomic number 58, Cemetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.bastnaesite, bastnasite - a yellow-to-brown mineral that is a source of rare earth elementsgadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbiummonazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium

Translations

cerium

enUK

cerium

(sēr`ēəm) [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799&degC;; b.p. 3,426&degC;; sp. gr. 6.77 at 25&degC;; 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.
..... Click the link for more information. 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
..... Click the link for more information. . 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.
..... Click the link for more information. ). 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

cerium

(Ce) [sēr´e-um] a chemical element, atomic number 58, atomic weight 140.12. (See Appendix 6.)

ce·ri·um (Ce),

(sēr'ē-ŭm), A metallic element, atomic no. 58, atomic wt. 140.115. [fr. Ceres, the planetoid]

ce·ri·um

(Ce) (sēr'ē-ŭm) A metallic element, atomic no. 58, atomic wt. 140.115. [fr. Ceres, the planetoid]

ce·ri·um

(Ce) (sēr'ē-ŭm) A metallic element, atomic no. 58, atomic wt. 140.115. [fr. Ceres, the planetoid]

Acronym

Definition

CERIUM➣Centre d'Études et de Recherches Internationales de l'Université de Montréal (French: Centre for International Studies and Research at the University of Montreal; Canada)

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Synonyms for cerium

noun a ductile grey metallic element of the lanthanide series

Synonyms

Related Words