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April 8, 2011 Good article nominee Listed
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Article changed over to new Wikipedia:WikiProject Elements format by mav 09:06, 2 Mar 2004 (UTC). Elementbox converted 11:54, 17 July 2005 by Femto (previous revision was that of 07:47, 14 July 2005).

Information Sources[edit]

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Einsteinium. Additional text was taken directly from the Elements database 20001107 (via and WordNet (r) 1.7 (via Data for the table were obtained from the sources listed on the subject page and Wikipedia:WikiProject Elements but were reformatted and converted into SI units.


i think this is all a load of kuk!!!!!! —Preceding unsigned comment added by (talk) 14:44, 14 October 2008 (UTC)

Why is it claimed to be both the seventh trans-uranic element and the seventh actinoid ? That doesn't look right. It looks like it should be the eleventh actinoid.Eregli bob (talk) 04:47, 15 February 2009 (UTC)

Natural occurance[edit]

Considering that Einsteinium and Fermium were both created in the explosion of a thermonuclear bomb, and that supernovae are far more powerful than any bomb that has ever been created, wouldn't it make sense that these elements may exist in trace amounts in supernova remnants? --Ferocious Flying Ferrets 19:45, 9 April 2010 (UTC)

Only for a very short while (on cosmic scales). Physchim62 (talk) 18:34, 25 November 2010 (UTC)

Isotopes produced in thermonuclear explosions[edit]

Es-254 (& Fm-254) are not produced in thermonuclear explosions since the beta decay chain ends at Cf-254, which does not undergo beta decay (it decays by spontaneous fission or, rarely, by alpha decay). (Similarly, Fm-253 is not produced either since Es-253 never decays by beta decay.) (talk) 06:42, 30 January 2011 (UTC)

The article does not say it is produced, upon a brief look. Materialscientist (talk) 11:11, 30 January 2011 (UTC)
     In the History section it states, "Some 238U atoms, however, could absorb another amount of
     neutrons, most likely 16 or 17, resulting in the 254Es and 255Es isotopes, respectively."
     (The following sentence says, "...also resulted in the 253Fm...".) (talk) 02:56, 31 January 2011 (UTC)

Missed that. Corrected. Thank you indeed. Materialscientist (talk) 03:33, 31 January 2011 (UTC)

GA Review[edit]

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

Reviewer: FREYWA 02:24, 4 April 2011 (UTC)

This is my first review...I have no idea of what to expect. But still, you can leave comments and I will address them. Check out my peer review as well. Good luck, editors. FREYWA 02:24, 4 April 2011 (UTC)

GA review – see WP:WIAGA for criteria

Ready to review.

  1. Is it reasonably well written?
    A. Prose quality:
    Yes check.svg Done
    You have some specifics in mind? Nergaal (talk) 02:53, 5 April 2011 (UTC)
  1. B. MoS compliance for lead, layout, words to watch, fiction, and lists:
    Yes check.svg Done
  2. Is it factually accurate and verifiable?
    A. References to sources:
    90 sources. Real good.
    B. Citation of reliable sources where necessary:
    One per paragraph - even better then the rule of thumb (one per section).
    C. No original research:
  3. Is it broad in its coverage?
    A. Major aspects:
    Per the guidelines, this has everything.
    B. Focused:
    Again, some specifics would be helpful. Nergaal (talk) 02:53, 5 April 2011 (UTC)
  4. Is it neutral?
    Fair representation without bias:
    The 4th criterion is equivalent to not looking like anything. And this article does.
  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:
    With something dealing with US confidential, there is no question on the pictures.
    B. Images are provided where possible and appropriate, with suitable captions:
  7. Overall:
    Pass or Fail:

Specifically, for section 1A, in the section on organomettalic compounds it says, "So experiments, have been performed..." and the comma there is something I want you to fix. For section 3B the section on the synthesis in nuclear explosions is a wall and looks intimidating. FREYWA 08:09, 5 April 2011 (UTC)

Worked a bit on both. Nergaal (talk) 17:02, 5 April 2011 (UTC)

Hold it - where is the a parameter for EsOCl (look at Chemical compounds → Halides → the last paragraph)? The prose is really good. Remove that "a = " and I will list einsteinium as a good article soon. I have to remove the a parameter myself. Then it will be a good article. FREYWA 08:13, 8 April 2011 (UTC)


Einsteinium was actually used for something! The Surveyor 5, 6, & 7 lunar landers carried an instrument that analyzed the chemical composition of the moon by measuring the energy of alpha particles from Cm-242 after they bounced off the lunar surface. Es-254 was "placed near the detectors as an energy marker" (Science vol. 158 p. 635). (talk) 07:01, 7 April 2011 (UTC)

Added. Thank you! Materialscientist (talk) 05:43, 11 April 2011 (UTC)
OK, then cite it and include it! FREYWA 08:24, 8 April 2011 (UTC)


Why is "Athenium" an alternate name? -- Beland (talk) 03:10, 15 August 2011 (UTC)

I've added information about that name to the lead. Double sharp (talk) 12:43, 19 January 2012 (UTC)
Removed. There is no evidence it is used, or was used more than a few times. The corresponding text in [1] is vague and is referenced by an unreliable source. If properly sourced, this might be considered for the "History" section, but not for the first line of the lead. Materialscientist (talk) 12:53, 19 January 2012 (UTC)
The name "athenium" was actually added some months ago, and I only added material from to state the origin of the name. However, I agree that it should not be in the lead. Double sharp (talk) 13:03, 19 January 2012‎ (UTC)

Elementium (El)[edit]

Renamed. — Preceding unsigned comment added by (talk) 18:06, 14 February 2013 (UTC)

No Natural Isotopes?[edit]

This article states that no isotopes of Einsteinuim occur in nature. However, in the Isotopes section of Californium's infobox, it show 253Cf as occuring in trace amounts in nature, presumable due to random transmutation/multiple neutron capture. However, several sources confirm that this isotope beta minus decays ~99.69% of the time into 253Es. Wouldn't this count as naturally-occuring Einsteinium?

Jacob S-589 (talk) 15:41, 24 August 2013 (UTC)

I asked this already in WikiProject_Elements last year, but didn't get a definite answer, unfortunately... --Roentgenium111 (talk) 17:45, 24 August 2013 (UTC)
Presumably the experiment that detected the 253Cf couldn't detect the 253Es for some reason. Even though we all know it must be there somewhere, I think we should leave it as (syn) for now. Double sharp (talk) 02:16, 25 August 2013 (UTC)