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cerium n. 鈰 鈰 cerium n 1: a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group [synonym: {cerium}, {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 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air. [1913 Webster] cerium
Symbol: Ce Atomic number: 58 Atomic weight: 140.12 Silvery metallic element, belongs to the lanthanoids. Four natural isotopes exist, and fifteen radioactive isotopes have been identified. Used in some rare-earth alloys. The oxidized form is used in the glass industry. Discovered by Martin .H. Klaproth in 1803.
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