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.

a ductile gray metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group

an iron-gray, lustrous metal. It is malleable, and oxidizes very readily at room temperature, especially in moist air. The pure metal may ignite when scratched with a knife. Cerium-141, -143, and -144 are radioisotopes of cerium. They emit beta particles during radioactive decay. [] [ Click "BackButton" for previous location