Dictionary Meaning and Definition on 'Cerium'
n : a ductile gray metallic element of the lanthanide series;
used in lighter flints; the most abundant of the
rare-earth group [syn: Ce, atomic number 58]
- Cerium \Ce"ri*um\, n. [Named by Berzelius in 1803 from the
asteroid Ceres, then just discovered (1801).] (Chem.)
A rare metallic element, occurring in the minerals cerite,
allanite, monazite, etc. Symbol Ce. Atomic weight 141.
- It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air.
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Wikipedia Meaning and Definition on 'Cerium'
Cerium is a chemical element with an atomic number of 58. This means that the nucleus of Cerium has 58 protons in it. The atomic mass of Cerium is 140.12. The Chemical symbol of Cerium is Ce and it is a member of the Lanthanide group.
Cerium is a grey, shiny or lustrous metal. At room temperature Cerium is a solid. It melts and becomes a liquid at 798oC and boils and becomes a gas at 3424oC. 0.0046% of the Earth's crust is Cerium which means that it is quite common - more common than Tin and Lead and nearly as common as zinc
Cerium was first found in Sweden in 1803 by Berzelius and Hisinger and Klaproth in Germany but because it is very reactive, it was not purified until 1875 in Washington DC. Cerium was named after the asteroid or minor planet Ceres which was first seen two years earlier in 1801.[See more about Cerium at Dictionary 3.0 Encyclopedia]