- a steel-gray, ductile metallic element of the rare-earth group found only in combination. Symbol: Ce; atomic weight: 140.12; atomic number: 58.
Origin of cerium
Examples from the Web for cerium
Not to mention rare elements such as lanthanum, cerium, and neodymium, essential to modern technology and commanding high prices.Afghanistan’s Mineral Wealth Could Be a Bonanza—or Lead to Disaster
Dr. Cheryl Benard
July 4, 2012
A rare metal, discovered by Mosander, associated with oxide of cerium.Cooley's Practical Receipts, Volume II
How much thorium, not to speak of cerium, could they take at a maximum.Tono Bungay
H. G. Wells
Piperine colours the sulphuric acid blood-red, and is turned dark-brown, almost black by the cerium oxide (Sonnenschein).
It tarnishes more easily and inflames less easily than cerium.
Cerium looks like iron, having both its color and lustre, but is heavier, and has the hardness of calcite.
- 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
Word Origin and History for cerium
element, first isolated in pure form in 1875, named for ceria, the name of the earth from which it was taken, which was discovered in 1803 and named by Berzelius and Hissinger for Ceres, the minor planet, which had been discovered in 1801 and named for the Roman goddess Ceres.
- A lustrous, malleable metallic rare-earth element that occurs chiefly in the minerals monazite and bastnaesite, exists in four allotropic states, and is used in lighter flint alloys. Atomic number 58.
- A shiny, gray metallic element of the lanthanide series. It is ductile and malleable and is used in electronic components, alloys, and lighter flints. It is also used in glass polishing, as a catalyst in self-cleaning ovens, and in various nuclear applications. Atomic number 58; atomic weight 140.12; melting point 795°C; boiling point 3,468°C; specific gravity 6.67 to 8.23; valence 3, 4. See Periodic Table.