|Isotope||Atomic mass (Da)||Isotopic abundance (amount fraction)|
|141Pr ||140.907 66(2)||1|
Praseodymium is a monoisotopic element and its atomic weight is determined solely by its isotope 141Pr.
The Commission last revised the standard atomic weight of praseodymium in 2013 based on the latest Atomic Mass Evaluation by IUPAP.
SOURCE Atomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003
Ar(Pr) = 140.907 66(2) since 2013
The name derives from the Greek prasios for "green" and didymos for "twin" because of the pale green
salts it forms. Praseodymium was discovered by the Austrian chemist Carl Auer (Baron von Welsbach) in 1885, who separated
it and the element neodymium from a didymium sample (didymium had previously been thought to be a separate element).