Isotopes_of_cerium
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Naturally occurring cerium (58Ce) is composed of 4 stable isotopes: 136Ce, 138Ce, 140Ce, and 142Ce, with 140Ce being the most abundant (88.45% natural abundance) and the only one that is theoretically stable. The others, 136Ce, 138Ce, and 142Ce are predicted to undergo double beta decay, which has never been observed. There are 35 radioisotopes that have been characterized, with the most stable be

* Calculated from Wikipedia data.
Accuracy is not guaranteed.

Isotopes of cerium (58Ce)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
Ce synth 3.16 d ε La
Ce 0.186% stable
Ce 0.251% stable
Ce synth 137.64 d ε La
Ce 88.4% stable
Ce synth 32.505 d β Pr
Ce 11.1% stable
Ce synth 33.039 h β Pr
Ce synth 284.89 d β Pr
Standard atomic weight Ar°(Ce)
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