| cerium | <chemical> An element of the rare earth family of metals. It has the atomic symbol ce, atomic number 58, and atomic weight 140.12. Cerium is a malleable metal used in industrial applications. Chemical name: Cerium (12 Dec 1998) |
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| cerium isotopes | Stable cerium atoms that have the same atomic number as the element cerium, but differ in atomic weight. Ce-136, 138, and 142 are stable cerium isotopes. (12 Dec 1998) |
| cerium radioisotopes | Unstable isotopes of cerium that decay or disintegrate emitting radiation. Ce atoms with atomic weights 132-135, 137, 139, and 141-148 are radioactive cerium isotopes. (12 Dec 1998) |