Optical theorem: Difference between revisions

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{{Infobox unbiseptium}}
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'''Unbiseptium''' {{IPAc-en|ˌ|uː|n|b|aɪ|ˈ|s|ɛ|p|t|i|əm}}, also called '''[[Mendeleev's predicted elements|eka]]-[[americium]]'''{{Citation needed|date=September 2012}}, is the hypothetical chemical element with atomic number '''127''' and symbol '''Ubs'''. It comes immediately after [[unbihexium]], element 126, which is expected to be the most stable element on an [[island of stability]].<ref name="emsley"/>
 
==Naming==
 
{{further|Systematic element name}}
 
The name '''unbiseptium''' is a systematic element name, used as a placeholder until its discovery is confirmed. [[Transuranium element]]s beyond [[californium]] are always created artificially, and the element usually ends up being named for a scientist or a laboratory that does work in atomic physics.{{citation needed|date=September 2012}}
 
==Synthesis of unbiseptium==
 
Unbiseptium has had one failed attempt at [[Synthetic element|synthesis]] in 1978 at the Darmstadt UNILAC accelerator by bombarding a natural [[tantalum]] target with [[xenon]] ions:<ref name="emsley">{{cite book|last=Emsley|first=John|title=Nature's Building Blocks: An A-Z Guide to the Elements|edition=New|year=2011|publisher=Oxford University Press|location=New York, NY|isbn=978-0-19-960563-7|page=593}}</ref>
 
:<math>\,^{nat}_{73}\mathrm{Ta} +  \,^{136}_{54}\mathrm{Xe} \to \,^{316, 317}\mathrm{Ubs} ^{*} \to \mbox{no atoms}.</math>
 
===Target-projectile combinations leading to Z=127 compound nuclei===
 
The below table shows various combinations of targets and projectiles leading to compound nuclei with an atomic number of 127.
 
{|class="wikitable" style="text-align:center"
|-
! Target !! Projectile !! CN !! Attempt result
|-
!<sup>180m</sup>Ta
|<sup>136</sup>Xe||<sup>316</sup>Ubs||{{no|Failure to date}}
|-
!<sup>181</sup>Ta
|<sup>136</sup>Xe||<sup>317</sup>Ubs||{{no|Failure to date}}
|-
|}
 
==References==
 
{{reflist}}
 
==See also==
 
*[[Unbihexium]]–[[Unbioctium]]
*[[Systematic element name]]
*[[Period 8 element]]
*[[superactinide]]
 
{{Compact extended periodic table}}
 
[[Category:Chemical elements]]
[[Category:Hypothetical chemical elements]]

Latest revision as of 01:33, 18 October 2014

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