Unbibium


Unbibium

-|
-|

Unbibium (pronEng|ənˈbɪbiəm) or eka-thorium is the temporary name of a (purportedly) recently discoveredcite journal
last=Marinov | first=A.
coauthors=Rodushkin, I.; Kolb, D.; Pape, A.; Kashiv, Y.; Brandt, R.; Gentry, R. V.; Miller, H. W.
title=Evidence for a long-lived superheavy nucleus with atomic mass number A=292 and atomic number Z=~122 in natural Th
journal=arXiv.org | year=2008
url=http://arxiv.org/abs/0804.3869
accessdate=2008-04-28
] chemical element in the periodic table that has the temporary symbol Ubb and has the atomic number 122.

History

The first attempt to synthesise element 122 was performed in 1972 by Flerov "et al" at Dubna, JINR, using the hot fusion reaction:

:,^{238}_{92}mathrm{U} + ,^{66}_{30}mathrm{Zn} o ,^{304}_{122}mathrm{Ubb} ^{*} o no atoms

No atoms were detected and a yield limit of 5 mb (5,000,000 pb) was measured. Current results (see ununquadium) have shown that the sensitivity of this experiment was too low by at least 6 orders of magnitude.

In 2000, the Gesellschaft für Schwerionenforschung performed a very similar experiment with much higher sensitivity:

:,^{238}_{92}mathrm{U} + ,^{70}_{30}mathrm{Zn} o ,^{308}_{122}mathrm{Ubb} ^{*} o no atoms

These results indicate that the synthesis of such heavier elements remains a significant challenge and further improvements of beam intensity and experimental efficiency is required. The sensitivity should be increased to 1 fb.

Possible discovery as a naturally occurring element

On April 24 2008, a group led by Amnon Marinov at the Hebrew University of Jerusalem claimed to have found single atoms of unbibium in naturally occurring thorium deposits at an abundance of between 10-11 and 10-12, relative to thorium.The claim of Marinov et al. was criticized by a part of the scientific community, and Marinov says he has submitted the article to the journals "Nature" and "Nature Physics" but both turned it down without sending it for peer review.. [ Royal Society of Chemistry, [http://www.rsc.org/chemistryworld/News/2008/May/02050802.asp "Chemistry World", "Heaviest element claim criticised" ] ]

See also

*Island of stability
*Systematic element name
* Unbiunium – Unbitrium

References

External links

* [http://www.chemistry-blog.com/2008/04/29/adressing-marinovs-element-122-claim/ Chemistry-Blog: Independent analysis of Marinov’s 122 claim]
* [http://www.webelements.com/webelements/elements/text/Ubb/index.html WebElements.com - Unbibium]
* [http://www.apsidium.com/elements/122.htm Likely properties of Unbibium]
* [http://www.phys.huji.ac.il/~marinov/index.htm Marinov's Site]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Unbibium — Unbiunium ← Unbibium → Unbitrium …   Wikipédia en Français

  • Unbibium — Eigenschaften …   Deutsch Wikipedia

  • unbibium — noun /ˌʌnˈbɪbiəm/ The systematic element name for the (as yet undiscovered) chemical element with atomic number 122 (symbol Ubb) …   Wiktionary

  • Élément 122 — Unbibium Unbibium Ubu ← …   Wikipédia en Français

  • Systematic element name — A systematic element name is the temporary name and symbol assigned to newly synthesized and not yet synthesized chemical elements. In chemistry, a transuranic element receives a permanent trivial name and symbol only after its synthesis has been …   Wikipedia

  • 122 (number) — ← 121 123 → 122 ← 120 121 122 123 124 125 126 …   Wikipedia

  • UBB — may mean:* Ubb, the abbreviation for Unbibium, an unsynthesized chemical element with atomic number 122 * Ubb, the fictional leader of the Yuggs in the Cthulhu mythos * UBB.classic, the name of Groupee s original but now discontinued Perl based… …   Wikipedia

  • Unbiunium — | |Unbiunium (pronEng|ˌʌnbiˈjuːniəm) is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Ubu and has the atomic number 121. Unbiunium is the first element whose ground state electron… …   Wikipedia

  • Eka-thorium — can be:* Unbibium (Ubb), unsynthesized chemical element with atomic number 122. * Unquadnilium (Uqn), unsynthesized chemical element with atomic number 140.ee also* Thorium * Eka actinium mdash; Eka protactinium …   Wikipedia

  • Unbitrium — | |Unbitrium (pronEng|ənˈbɪtriəm) is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Ubt and has the atomic number 123. NamingThe name unbitrium is a systematic element name, used as a… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.