Main Page: Difference between revisions

From formulasearchengine
Jump to navigation Jump to search
← Older edit
No edit summary
No edit summary
 
(412 intermediate revisions by more than 100 users not shown)
Line 1: Line 1:
{{Redirect|Ubh}}
This is a preview for the new '''MathML rendering mode''' (with SVG fallback), which is availble in production for registered users.
{{Infobox unbihexium}}
'''Unbihexium''' ({{IPAc-en|icon|ˌ|uː|n|b|aɪ|ˈ|h|ɛ|k|s|i|ə|m}}), also known as '''[[Mendeleev's predicted elements|eka]]-[[plutonium]]''' or element 126, is a hypothetical [[chemical element]] with [[atomic number]] 126 and symbol Ubh. It is of interest because of its location at the peak of the hypothesized [[island of stability]].


==History==
If you would like use the '''MathML''' rendering mode, you need a wikipedia user account that can be registered here [[https://en.wikipedia.org/wiki/Special:UserLogin/signup]]
The first attempt to synthesize unbihexium was performed in 1971 by Bimbot ''et al.'' using the hot fusion reaction:
* Only registered users will be able to execute this rendering mode.
* Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.


:<math>\,^{232}_{90}\mathrm{Th} + \,^{84}_{36}\mathrm{Kr} \to \,^{316}_{126}\mathrm{Ubh} ^{*} \to \  no \ atoms</math>
Registered users will be able to choose between the following three rendering modes:  


A high energy [[alpha particle]] was observed and taken as possible evidence for the synthesis of unbihexium. Recent research{{which?|date=October 2011}} suggests that this is highly unlikely as the sensitivity of experiments performed in 1971 would have been several orders of magnitude too low according to current understanding.
'''MathML'''
:<math forcemathmode="mathml">E=mc^2</math>


To date, no other attempt has been made to synthesize unbihexium.
<!--'''PNG'''  (currently default in production)
:<math forcemathmode="png">E=mc^2</math>


==Target-projectile combinations leading to Z=126 compound nuclei==
'''source'''
The table below contains various combinations of targets and projectiles which could be used to form compound nuclei with Z=126. The only practical [[isotope]]s of unbihexium that would be considerably longer-lived than others are <sup>310</sup>Ubh and <sup>322</sup>Ubh.
:<math forcemathmode="source">E=mc^2</math> -->


{|class="wikitable" style="text-align:center"
<span style="color: red">Follow this [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering link] to change your Math rendering settings.</span> You can also add a [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering-skin Custom CSS] to force the MathML/SVG rendering or select different font families. See [https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode these examples].
!Target!!Projectile!!CN!!Attempt result
|-
!<sup>232</sup>Th
|<sup>84</sup>Kr||<sup>316</sup>Ubh||{{No|Failure to date}}
|}


Another way to synthesize unbihexium would be to overshoot it by fusion of <sup>130</sup>Te and <sup>204</sup>Hg; successive alpha decay of the compound nucleus <sup>334</sup>Utb would land right on <sup>322</sup>Ubh (predicted to be relatively stable). <sup>130</sup>Te constitutes about 34% of the natural element; however, <sup>204</sup>Hg only constitutes about 7% of natural mercury. This method of synthesis could also be used to synthesize <sup>298</sup>[[Flerovium|Fl]], after the alpha decay of <sup>322</sup>Ubh.
==Demos==


==Stable unbihexium==
Here are some [https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Frederic.wang demos]:
Calculations according to the [[Hartree-Fock method|Hartree-Fock]]-Bogoliubov Method using the non-relativistic Skyrme interaction have proposed Z=126 as a [[nuclear shell model|closed proton shell]]. In this region of the periodic table, N=184 and N=196 have been suggested as [[nuclear shell model|closed neutron shell]]s. Therefore the isotopes of most interest are <sup>310</sup>Ubh and <sup>322</sup>Ubh, for these might be considerably longer-lived than other isotopes.


==Predicted chemistry==
Unbihexium is predicted to belong to a new block of [[Valence electron|valence]] g-electron atoms, although the g-block's position left of the [[f-block]] is speculative. The expected electron configuration is [Uuo]5[[g-orbital|g]]<sup>6</sup> 8[[s-orbital|s]]<sup>2</sup> although there may be a smearing out of the energies of 5g, 6f and 7[[d-orbital|d]] orbitals.


Recent calculations have suggested a stable [[Fluoride|monofluoride]] UbhF may be possible, resulting from a bonding interaction between the 5g [[Atomic orbital|orbital]] on Ubh and the 2[[p-orbital|p]] orbital on [[fluorine]].<ref>{{Cite journal|last=Jacoby|first=Mitch|title=As-yet-unsynthesized superheavy atom should form a stable diatomic molecule with fluorine|journal=Chemical & Engineering News|year=2006|volume=84|issue=10|pages=19|url=http://pubs.acs.org/cen/news/84/i10/8410notw9.html|accessdate=2008-01-14}}</ref>  Other predicted oxidation states include III, IV, VI, and VIII.
* accessibility:
** Safari + VoiceOver: [https://commons.wikimedia.org/wiki/File:VoiceOver-Mac-Safari.ogv video only], [[File:Voiceover-mathml-example-1.wav|thumb|Voiceover-mathml-example-1]], [[File:Voiceover-mathml-example-2.wav|thumb|Voiceover-mathml-example-2]], [[File:Voiceover-mathml-example-3.wav|thumb|Voiceover-mathml-example-3]], [[File:Voiceover-mathml-example-4.wav|thumb|Voiceover-mathml-example-4]], [[File:Voiceover-mathml-example-5.wav|thumb|Voiceover-mathml-example-5]], [[File:Voiceover-mathml-example-6.wav|thumb|Voiceover-mathml-example-6]], [[File:Voiceover-mathml-example-7.wav|thumb|Voiceover-mathml-example-7]]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Audio-Windows7-InternetExplorer.ogg Internet Explorer + MathPlayer (audio)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-SynchronizedHighlighting-WIndows7-InternetExplorer.png Internet Explorer + MathPlayer (synchronized highlighting)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Braille-Windows7-InternetExplorer.png Internet Explorer + MathPlayer (braille)]
** NVDA+MathPlayer: [[File:Nvda-mathml-example-1.wav|thumb|Nvda-mathml-example-1]], [[File:Nvda-mathml-example-2.wav|thumb|Nvda-mathml-example-2]], [[File:Nvda-mathml-example-3.wav|thumb|Nvda-mathml-example-3]], [[File:Nvda-mathml-example-4.wav|thumb|Nvda-mathml-example-4]], [[File:Nvda-mathml-example-5.wav|thumb|Nvda-mathml-example-5]], [[File:Nvda-mathml-example-6.wav|thumb|Nvda-mathml-example-6]], [[File:Nvda-mathml-example-7.wav|thumb|Nvda-mathml-example-7]].
** Orca: There is ongoing work, but no support at all at the moment [[File:Orca-mathml-example-1.wav|thumb|Orca-mathml-example-1]], [[File:Orca-mathml-example-2.wav|thumb|Orca-mathml-example-2]], [[File:Orca-mathml-example-3.wav|thumb|Orca-mathml-example-3]], [[File:Orca-mathml-example-4.wav|thumb|Orca-mathml-example-4]], [[File:Orca-mathml-example-5.wav|thumb|Orca-mathml-example-5]], [[File:Orca-mathml-example-6.wav|thumb|Orca-mathml-example-6]], [[File:Orca-mathml-example-7.wav|thumb|Orca-mathml-example-7]].
** From our testing, ChromeVox and JAWS are not able to read the formulas generated by the MathML mode.


==Unbihexium in popular culture==  
==Test pages ==
The science fiction short story "Silence is Golden" by American science fiction author [[Lou Antonelli]] is based on the supposed discovery of unbihexium in a Texas open-pit mine. The story, published by Revolution Science Fiction in August 2003, received an Honorable Mention in "The Year's Best Science Fiction, 21st annual collection" (St. Martin's Press, New York, N.Y. [[Gardner Dozois]], ed. 2004). 


==See also==
To test the '''MathML''', '''PNG''', and '''source''' rendering modes, please go to one of the following test pages:
*[[Island of stability]]: [[Flerovium]]–[[Unbinilium]]–Unbihexium
*[[Displaystyle]]
*[[Unbipentium]]–[[Unbiseptium]]
*[[MathAxisAlignment]]
*[[Period 8 element]]
*[[Styling]]
*[[Linebreaking]]
*[[Unique Ids]]
*[[Help:Formula]]


==References==
*[[Inputtypes|Inputtypes (private Wikis only)]]
{{Reflist}}
*[[Url2Image|Url2Image (private Wikis only)]]
{{Use dmy dates|date=September 2010}}
==Bug reporting==
 
If you find any bugs, please report them at [https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions&component=Math&version=master&short_desc=Math-preview%20rendering%20problem Bugzilla], or write an email to math_bugs (at) ckurs (dot) de .
{{Compact extended periodic table}}
 
[[Category:Chemical elements]]
[[Category:Hypothetical chemical elements]]
 
[[de:Unbihexium]]
[[el:Ουνμπιχέξιο]]
[[fr:Unbihexium]]
[[ko:운비헥슘]]
[[id:Unbiheksium]]
[[mrj:Унбигексий]]
[[ja:ウンビヘキシウム]]
[[pl:Unbihexium]]
[[ru:Унбигексий]]
[[sk:Unbihexium]]
[[vi:Unbihexi]]
[[zh:Ubh]]

Latest revision as of 23:52, 15 September 2019

This is a preview for the new MathML rendering mode (with SVG fallback), which is availble in production for registered users.

If you would like use the MathML rendering mode, you need a wikipedia user account that can be registered here [[1]]

  • Only registered users will be able to execute this rendering mode.
  • Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.

Registered users will be able to choose between the following three rendering modes:

MathML


Follow this link to change your Math rendering settings. You can also add a Custom CSS to force the MathML/SVG rendering or select different font families. See these examples.

Demos

Here are some demos:


Test pages

To test the MathML, PNG, and source rendering modes, please go to one of the following test pages:

Bug reporting

If you find any bugs, please report them at Bugzilla, or write an email to math_bugs (at) ckurs (dot) de .

Retrieved from "https://en.formulasearchengine.com/index.php?title=Main_Page&oldid=329754"