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WikiProject Elements (Rated GA-class, Mid-importance)
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Article changed over to new Wikipedia:WikiProject Elements format by schnee. Elementbox converted 11:00, 10 July 2005 by Femto (previous revision was that of 13:13, 9 July 2005). 9 July 2005

Information SourcesEdit

Data for the table was obtained from the sources listed on the subject page and Wikipedia:WikiProject Elements but was reformatted and converted into SI units.


The pronunciation on the page begins with a 'pra' sound, this does not agree with the infobox where both pronunciations begin with the sound 'pray'. I'm not sure if these are alternatives or one is in error. -- deflective (talk) 02:06, 28 September 2010 (UTC)

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GA ReviewEdit

This review is transcluded from Talk:Praseodymium/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: Parcly Taxel (talk · contribs) 10:03, 13 June 2017 (UTC)

I'm going to the National University of Singapore in August this year to study mathematics. I never lost my love for this project – indeed I'm amazed at how many articles have been lifted to GA status in the recent months, completing the "transperiodic highway" I once bragged about. Once in university I'll have access to the central library where (hopefully) I can find references for my own FA pushes. In the meantime, though, time to review this. Parcly Taxel 10:03, 13 June 2017 (UTC)

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Problems (I corrected them as I moved along)

  • Praseodymium only has one stable isotope, 141Pr, which makes up all of natural praseodymium: hence praseodymium is a mononuclidic element and its relative atomic mass is a constant of nature that can be determined with great precision. This isotope has 82 neutrons and is hence magic, conferring on it additional stability. "great precision" sounds like an exaggeration, and furthermore relative atomic masses do vary between samples. Repetition of praseodymium too in the first sentence.
"Great precision" is to mean: precision only dependent on measurement precision, especially not on sample selection, because all samples have the same nuclide. It's the multi-nuclidic elements that have varieties between samples, as an extra cause of imprecision. Language could be improved indeed (but not by me). -DePiep (talk) 14:39, 13 June 2017 (UTC)
  • Praseodymium dissolves readily in dilute sulfuric acid to form solutions containing the chartreuse Pr3+ ions, which exist as a [Pr(H2O)9]3+ complexes: whoops.
  • High but uncertain coordination numbers and poorly defined stereochemistry is the rule… Rather iffy.
  • The first reference in the history section could be was made more reliable.
  • Praseodymium's classification as a rare earth metal rather comes from the fact that it is rarer than "common earths" such as lime and magnesia, and that only a few minerals for which praseodymium extraction is commercially viable are known. The process of extraction is also rather long and arduous. Lots of words here and two related sentences, can be trimmed.
  • The Gibbs free energy of formation for the formation of the Ln(edta·H) complexes increase along the lanthanides by about one quarter from Ce3+ to Lu3+, so that the Ln3+ cations descend the development column in a band and are fractionated repeatedly, so that they are eluted from the heaviest to the lightest. More confused words.
  • …but the main side effects from inhalation of rare earth oxides in humans come not from the rare earths themselves but from the radioactive thorium and uranium impurities, as the rare earths tend to occur together with these elements. Ditto.

Source for Pr(V)?Edit

Because without sources, it looks it's nonexistent. Alfa-ketosav (talk) 20:13, 18 November 2018 (UTC)

Reference 19. Double sharp (talk) 05:06, 19 November 2018 (UTC)
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