Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Forty radioisotopes have been characterized with the most stable being 143Pr, with a half-life of 13.57 days and 142Pr, with a half-life of 19.12 hours.
Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Forty radioisotopes have been characterized with the most stable being 143Pr, with a half-life of 13.57 days and 142Pr, with a half-life of 19.12 hours.
Source: Wikipedia "Isotopes of praseodymium" · CC BY-SA 4.0
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