Jump to content

Talk:Samarium/Archive 1

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia
Archive 1

Mergers

There will be much to say about the element itself. There can be a separate topic on the chemistry and compounds of Samarium. Don't merge please ----

Question? How can you be sure there is no stable EE62SM146? It is unique in not being stable with only 2 additional neutrons above the lowest stable samarian isotope EE62SM144? All the other rare earth elements have stable isotopes in such a circumstance. And it's a long half life element, so why couldn't a portion of it be stable, And the article makes no mention of this irregularity. WFPMWFPM (talk) 00:37, 2 November 2008 (UTC)WFPM (talk) 21:52, 1 July 2009 (UTC)

These three articles have been tagged for their lack of notability - I suggest that they get 'merged' into this article. They are already mentioned by their chemical symbols in the compound section - I suggest with the addition of their names the 'merger' will be complete. Madmedea 15:53, 11 January 2007 (UTC)

Would anyone please enlighten me what is being proposed to merge ? Thank you indeed. Materialscientist (talk) 22:16, 1 July 2009 (UTC)

radioactive decay

Sm-149 (along with 146, 147, & 148) would decay by alpha emission, not beta decay (Eu-149 decays to Sm-149 by electron capture). Is there any reference for the decay of Sm-149? At least one isotope table lists it as stable. 69.72.27.34 (talk) 07:35, 12 February 2011 (UTC)

I shall remove that info from the infobox, as I can't find reliable reference for alpha decay - [1] [2] [3] say it is stable. Materialscientist (talk) 07:51, 12 February 2011 (UTC)
The Isotopes section (& Isotopes of samarium entry) still describe Sm-149 as radioactive. 69.72.27.75 (talk) 05:13, 13 February 2011 (UTC)
Thanks. "Corrected". My CRC copy lists it as alpha emitter (will check a newer version tomorrow). Confusing situation. The estimated lifetime is not unmeasurably long. Materialscientist (talk) 05:38, 13 February 2011 (UTC)
I remember seeing it listed as an alpha emitter once upon a time... Confusing indeed. 69.72.27.243 (talk) 08:59, 13 February 2011 (UTC)

Assorted problems

  • Compounds - Sm - if the symmetry is rhombohedral shouldn't a=b=c? SmH3 - if the symmetry is cubic a=b=c.
  • Halides - there is no double bond in 1,2-diiodoethane.
  • Borides - "Increasing the temperature results in the preferential formation of Sm6" - presumably this should be SmB6.
  • Other inorganic compounds - Sn & Pb are not non-metallic (Ge & Sb are debatable).
  • Organometallic compounds - Sm(OR)Cl3 should be Sm(OR)3.
  • Isotopes - Sm-146 also has a half-life of (much) more than 2 days. If Sm-149 decays it (along with Sm-146, 147, & 148) would be by alpha emission.
  • Applications - "most of the fusion and decay products of samarium-149" should be "most of the neutron capture products of samarium".
Fixed all, stumbled here - that sentence meant to say that the "initial" Sm-149, after various capture and decay cycles in the reactor, would produce neutron-capturing isotopes. Materialscientist (talk) 04:02, 25 February 2011 (UTC)
  • Non-commercial applications - Samarium-neodymium dating would not use Sm-146, which does not occur in nature (except possibly in trace amounts). It presumably uses Sm-147 & Nd-143 (Sm-148 & Nd-144 should also work but would be less sensitive).

There are also some minor typos; is it worth listing them? 69.72.27.247 (talk) 03:12, 25 February 2011 (UTC)

Yes, or just fix them directly. Materialscientist (talk) 04:02, 25 February 2011 (UTC)

OK, minor typos:

GA Review

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

Reviewer: FREYWA 09:54, 1 May 2011 (UTC)

Copper may be complete, but we have another review going on! This is samarium, and the test begins now!

Review

GA review – see WP:WIAGA for criteria

  1. Is it reasonably well written?
    A. Prose quality:
    There are a lot of holes in the article, most of them in the history. "Reasonably pure element was created...", "Later Boisbaudran's samaria was transformed into samarium...", "...it was not until recent years that relatively pure samarium has been isolated through ion exchange processes...", and so on. FIX THEM!
    B. MoS compliance for lead, layout, words to watch, fiction, and lists:
    The lead and layout are fine, as is the fiction and lists, but what about the words to watch? There is a however in the lead section! Now, look for also's and however's in the body of the article and remove them (example: the borides section).
  2. Is it factually accurate and verifiable?
    A. References to sources:
    B. Citation of reliable sources where necessary:
    C. No original research:
  3. Is it broad in its coverage?
    A. Major aspects:
    B. Focused:
  4. Is it neutral?
    Fair representation without bias:
  5. Is it stable?
    No edit wars, etc:
  6. Does it contain images to illustrate the topic?
    A. Images are copyright tagged, and non-free images have fair use rationales:
    B. Images are provided where possible and appropriate, with suitable captions:
  7. Overall:
    Pass or Fail:

Comments

Recycling method for neodymium and samarium

Perhaps mention in article, see Recycling of neodymium and samarium KVDP (talk) 07:59, 1 June 2013 (UTC)

Strange sentence re halide structures

The following statement was ín the version that passed GA "...samarium halides change their crystal structures when one type of halide atoms is substituted for another, which is an uncommon behavior for most elements (e. g. actinides)." ???? Quickly looking at Wells, the structures of all the lanthanide halides change when the halide changes, even most of the actinides, which is simplistically is what would be expected. The statement is so obviously wrong that something else must surely have been intended, but I'm struggling to see what it is. Axiosaurus (talk) 09:39, 6 February 2014 (UTC)

Hello fellow Wikipedians,

I have just added archive links to one external link on Samarium. Please take a moment to review my edit. If necessary, add {{cbignore}} after the link to keep me from modifying it. Alternatively, you can add {{nobots|deny=InternetArchiveBot}} to keep me off the page altogether. I made the following changes:

When you have finished reviewing my changes, please set the checked parameter below to true to let others know.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers. —cyberbot IITalk to my owner:Online 14:21, 27 August 2015 (UTC)

Hi. Link to Florencite-(Sm) does not work. Please help. Cheers, Eudialytos (talk) 16:26, 12 March 2016 (UTC)

Sorry to say so, but you created a link Florencite-(Sm) but you created the article Florencite-(sm) and S and s are treated in a way that the link does not work.--Stone (talk) 22:02, 12 March 2016 (UTC)

Untitled

Article changed over to new Wikipedia:WikiProject Elements format by schnee. Elementbox converted 11:14, 10 July 2005 by Femto (previous revision was that of 13:24, 9 July 2005). 9 July 2005

Information Sources

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Samarium. 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.