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What (who) is praseodymium$62979$ - definition
![[[Carl Auer von Welsbach]] (1858–1929), discoverer of praseodymium in 1885.](https://commons.wikimedia.org/wiki/Special:FilePath/Auer von Welsbach.jpg?width=200 "[[Carl Auer von Welsbach]] (1858–1929), discoverer of praseodymium in 1885.")
 hydroxide.jpg?width=200 "Praseodymium(III) hydroxide")
Wikipedia
Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Thirty-eight 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. All of the remaining radioactive isotopes have half-lives that are less than 5.985 hours and the majority of these have half-lives that are less than 33 seconds. This element also has 15 meta states with the most stable being 138mPr (t1/2 2.12 hours), 142mPr (t1/2 14.6 minutes) and 134mPr (t1/2 11 minutes).
The isotopes of praseodymium range in atomic weight from 120.955 u (121Pr) to 158.955 u (159Pr). The primary decay mode before the stable isotope, 141Pr, is electron capture and the mode after is beta decay. The primary decay products before 141Pr are element 58 (cerium) isotopes and the primary products after are element 60 (neodymium) isotopes.
