Talk:Dubnium
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Article changed over to new Wikipedia:WikiProject Elements format by maveric149. Elementbox converted 10:23, 15 July 2005 by Femto (previous revision was that of 14:48, 12 July 2005).
Contents |
[edit] Information Sources
Some of the text in this entry was rewritten from Los Alamos National Laboratory - Dubnium.
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.
[edit] Talk
[edit] Evidence??
Text says:
- This relatively high stability compared to the surrounding elements on the periodic table gives evidence that by manipulating the number of neutrons in a nucleus, one can alter the stabilities of such nuclei.
I say: why is that an issue? I thought it was proven since early 20th century. Maybe the text intends towards the island of stability? Rursus 21:22, 30 November 2006 (UTC)
[edit] Former contradiction (now fixed since anno dazumal)
The first sentence of the history section contains a contradiction:
"Dubnium ... was reportly first synthesized in early 1970 by Albert Ghiorso in Dubna..."
Ghiorso worked in Berkeley. I suspect that this sentence is a compromise between the two competing versions of the history of the discovery:
1) the element was discovered by Ghiorso in Berkeley
2) the element was discovered by Flyorov in Dubna
--Anon
- Fixed. Thanks for the note. --mav
[edit] Density
Hello,
Is the estimated density really 39 g·cm—3? This is nearly twice that of other heavy elements... Yann 23:21, 1 June 2007 (UTC)
- Also, what's the source for this number? Both of the two sites linked at the bottom of the page either don't give a density, or say "no data". Unless there is a reliable source, this should be simply omitted. Kingdon 14:51, 4 June 2007 (UTC)
[edit] Production of Dubnium 268
Dubnium 268 is listed on the isotope table but there is no mention of its production. —Preceding unsigned comment added by 71.229.45.155 (talk • contribs)
[edit] Halflife error
Couldn't find anything about this 268Db having a halflife of 29h, except this link: Fig Branch, whose text happenstance is the same as that of this article. Halflife of 29h seems to be a grave error. I'll soon correct the text... 268Db has been extrapolated to a half life of 6h acc2 nutab03, but that is an extrapolation. I'm going to try to find 268Db from research published on the net. If that fails, the halflife is guessed to be 6h, nothing else. Said: Rursus ☻ 16:31, 1 June 2008 (UTC)
- Correcting myself: there are about 15 sources on Google claiming 268Db hl=29 h, all of them being copies of Wikipedia. Still searching. Said: Rursus ☻ 16:39, 1 June 2008 (UTC)
- This link is pretty trustable:
- It's a little oldish, from 2004, it says 16 hours. The half life might have been remeasured since then. I'm going on. Said: Rursus ☻ 16:45, 1 June 2008 (UTC)
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- The oldest value is the 6h extrapolation, then came 16h (by Oganessian et al. 2004), then a tentative 32h (2005, M. GUPTA, THOMAS W. BURROWS??) and a current value of 28h (S. Geraedts and B. Singh (McMaster), 2007). Said: Rursus ☻ 18:17, 1 June 2008 (UTC)
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