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Good article Mendelevium has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
Good topic star Mendelevium is part of the Actinides series, a good topic. This is identified as among the best series of articles produced by the Wikipedia community. If you can update or improve it, please do so.
Article milestones
Date Process Result
August 7, 2014 Good article nominee Listed
September 29, 2014 Good topic candidate Promoted
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Article changed over to new Wikipedia:WikiProject Elements format by mav 09:29, 20 Feb 2004 (UTC). Elementbox converted 12:05, 17 July 2005 by Femto (previous revision was that of 23:54, 10 July 2005).

Information Sources[edit]

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


Redirect: unnilunium

Source for history[edit]

We can mine this article by one of the codiscoverers of Md. After that everything is done, we can get GA, and we can move on to the next actinide: nobelium. Double sharp (talk) 14:38, 6 August 2014 (UTC)

GA Review[edit]

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

Reviewer: Parcly Taxel (talk · contribs) 01:24, 7 August 2014 (UTC)

This is not Taipei 101, this is element 101. And like some of the other transuranium elements, I'm the reviewer. Parcly Taxel 01:24, 7 August 2014 (UTC)

GA review – see WP:WIAGA for criteria

  1. Is it reasonably well written?
    A. Prose is "clear and concise", without copyvios, or spelling and grammar errors:
    B. MoS compliance for lead, layout, words to watch, fiction, and lists:
  2. Is it factually accurate and verifiable?
    A. Has an appropriate reference section:
    B. Citation to 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 tagged with their copyright status, and valid fair use rationales are provided for non-free content:
    B. Images are provided if possible and are relevant to the topic, and have suitable captions:
  7. Overall:
    Pass or Fail:


  • "…with a half-life of 51 days: ; nevertheless, the shorter-lived…" (semicolon, not colon)


  • "It was first synthesized by Albert Ghiorso, Glenn T. Seaborg, Gregory R. Choppin, Bernard G. Harvey, and Stanley G. Thompson (team leader) team leader Stanley G. Thompson in early 1955…"
  • "The number of atoms that would be produced would be approximately equal to the number of atoms of target material times its cross section times the ion beam intensity times the time of bombardment related to the half-life of the product when bombarding for a time of the order of its half-life." Too many times; reword to "The number of atoms that would be produced would be approximately equal to the product of the number of atoms of target material, the target's cross section, the ion beam intensity, and the time of bombardment; this last factor was related to the half-life of the product when bombarding for a time on the order of its half-life."
  • "…to obtain the needed intensity of 1014 alpha particles per second: ; Seaborg applied for the necessary funds." Again, semicolon and not colon.
  • "The foil could be removed periodically and a new foil could be installed. replaced." Also merge with previous sentence with "and".
  • "The solution drops were collected on platinum disks. and dried under heat lamps." No middle full stop.
  • "Additional analysis and further experimentation, showed the produced mendelevium isotope to have mass 256 and to decay by electron capture with a half-life of 1.5 h." No comma.


  • "The lanthanides and actinides, in the metallic state, can exist as either divalent (for example, such as europium and ytterbium) or trivalent (most other lanthanides) metals."
  • "…suggesting that mendelevium(III) could be easily oxidized to mendelevium(IV), 1967 experiments with the strong oxidizing agent sodium bismuthate was were unable to oxidize mendelevium(III) to mendelevium(IV)."
  • "…although experimental verification of this electron configuration was had not yet been made as of 2006."
  • "The ionic radius of hexacoordinate Md3+ has had been preliminarily estimated in 1978 to be around 91.2 pm: ;[13] 1988 calculations based on the logarithmic trend between distribution coefficients and ionic radius… Md2+ should have an ionic radius of 115 pm and hydration enthalpy −1413 kJ·mol−1: ; Md+ should have ionic radius 117 pm." Two colon errors here.
  • "Sixteen isotopes of mendelevium are known, with mass numbers from 245 to 260: ; all are radioactive." Colon error.

Production and isolation

  • "The mendelevium atoms would be are then trapped in a gas atmosphere (frequently helium), which would enter the vacuum chamber in and a gas jet from a small opening in the reaction chamber, carrying carries the mendelevium along."
  • "…the mendelevium atoms can be transported over tens of metres to be chemically analyzed and have their quantity determined."
  • "Using the gas-jet method often renders the first two steps usually unnecessary."
  • "Another possible way to separate the trivalent actinides can be achieved by is via solvent extraction chromatography using bis-(2-ethylhexyl) phosphoric acid (abbreviated as HDEHP) as the stationary organic phase and nitric acid as the mobile aqueous phase."
  • "The mendelevium separated by this method has the advantage to be of being free of organic complexing agent compared to the resin column." Also merge with next sentence using a semicolon. Parcly Taxel 01:24, 7 August 2014 (UTC)

Scrap all of it, I made the changes myself. Review PASSED! Parcly Taxel 01:38, 7 August 2014 (UTC)

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