Conservation of energy - Revision history

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			My name is Wilfredo Norcross. I life in Bergen (Norway).<br><br>my website ... [https://itunes.apple.com/us/artist/arthur-falcone/id314222640 arthur falcone]

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en>Fraggle81: Reverted 1 edit by 135.0.192.221 (talk) to last revision by Fraggle81. (TW)

2014-02-22T23:24:56Z

Reverted 1 edit by 135.0.192.221 (talk) to last revision by Fraggle81. (TW)

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117.216.70.17: /* Noether's theorem */

2014-01-28T17:14:07Z

Noether's theorem

← Older revision		Revision as of 19:14, 28 January 2014
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	~~The~~ name of the ~~author is Crysta~~. ~~Montana is where he's always~~ been ~~living~~. ~~Distributing production~~ is ~~when he lumber species living~~. ~~Caravaning~~ is ~~some thing I've~~ in ~~dire straits years~~.<br><br>~~Here is my web-site~~ ... http://~~nouveauclashofclanstriche~~.~~blogspot~~.com/ ([http://~~nouveauclashofclanstriche~~.~~blogspot~~.com/ ~~nouveauclashofclanstriche~~.~~blogspot~~.~~com~~])		{{Infobox ununennium}}
			'''Ununennium''', also known as '''[[Mendeleev's predicted elements\|eka]]-[[francium]]''' or element 119, is the temporary name of a [[chemical element]] in the [[periodic table]] that has the temporary symbol '''Uue''' and has the [[atomic number]] 119. To date, attempted syntheses of this element have been unsuccessful. Since it is below the [[alkali metals]] it might have properties similar to those of [[francium]] or [[caesium]] and thus be extremely reactive with water and air (though [[relativistic quantum chemistry\|relativistic effects]] might make it less reactive than francium and caesium). A predicted oxidation state is +1; however, unlike all the other alkali metals, it is also predicted to show the +3 oxidation state.

			Ununennium would be the first element in the eighth [[periodic table period\|period]] of the [[periodic table]].

			==Attempts at synthesis==
			The synthesis of ununennium was attempted in 1985 by bombarding a target of [[einsteinium]]-254 with [[calcium]]-48 ions at the superHILAC accelerator at Berkeley, California:
			:<math>\,^{254}_{99}\mathrm{Es} + \,^{48}_{20}\mathrm{Ca} \to \,^{302}_{119}\mathrm{Uue} ^{*} </math>
			No atoms were identified, leading to a limiting yield of 300 [[barn (unit)\|nb]].<ref>{{cite journal\|title=Search for superheavy elements using <sup>48</sup>Ca + <sup>254</sup>Es<sup>g</sup> reaction\|journal=Physical Reviews C\|year=1985\|pages=1760–1763\|doi=10.1103/PhysRevC.32.1760\|volume=32\|issue=5\|bibcode = 1985PhRvC..32.1760L\|last1=Lougheed\|first1=R.\|last2=Landrum\|first2=J.\|last3=Hulet\|first3=E.\|last4=Wild\|first4=J.\|last5=Dougan\|first5=R.\|last6=Dougan\|first6=A.\|last7=Gäggeler\|first7=H.\|last8=Schädel\|first8=M.\|last9=Moody\|first9=K. \|displayauthors=11}}</ref>

			As of May 2012, plans are under way to attempt to synthesize the isotopes <sup>295</sup>Uue and <sup>296</sup>Uue by bombarding a target of [[berkelium]] with [[titanium]] at the [[GSI Helmholtz Centre for Heavy Ion Research]] in [[Darmstadt]], Germany:<ref name="economist">[http://www.economist.com/node/21554502 Modern alchemy: Turning a line], [[The Economist]], May 12, 2012.</ref><ref>Düllmann, Christoph E. (October 20, 2011). [http://fias.uni-frankfurt.de/kollo/Duellmann_FIAS-Kolloquium.pdf Superheavy Element Research: News from GSI and Mainz]. Johannes Gutenberg University Mainz; GSI Helmholtzzentrum für Schwerionenforschung GmbH; Darmstadt Helmholtz Institute Mainz.</ref>
			:<math>\,^{249}_{97}\mathrm{Bk} + \,^{50}_{22}\mathrm{Ti} \to \,^{296}_{119}\mathrm{Uue} \,+3\,^{1}_{0}\mathrm{n}</math>

			:<math>\,^{249}_{97}\mathrm{Bk} + \,^{50}_{22}\mathrm{Ti} \to \,^{295}_{119}\mathrm{Uue} \,+4\,^{1}_{0}\mathrm{n}</math>

			==Predicted decay characteristics==
			The alpha-decay half-lives of 1700 nuclei with 100 ≤ Z ≤ 130 have been calculated in a quantum tunneling model with alpha-decay Q-values from different mass estimates.<ref name=npa07>{{cite journal\|journal=Nucl. Phys. A\|volume=789\|pages=142–154\|year=2007\|title=Predictions of alpha decay half lives of heavy and superheavy elements\|author=Chowdhury, P. Roy; Samanta, C. and Basu, D. N. \|doi=10.1016/j.nuclphysa.2007.04.001\|bibcode=2007NuPhA.789..142S\|arxiv = nucl-th/0703086 }}</ref><ref>{{cite journal\|journal=Phys. Rev. C\|volume=77\|pages=044603\|year=2008\|title=Search for long lived heaviest nuclei beyond the valley of stability\|author=Chowdhury, P. Roy; Samanta, C. and Basu, D. N. \|doi=10.1103/PhysRevC.77.044603\|issue=4\|bibcode=2008PhRvC..77d4603C\|arxiv = 0802.3837 }}</ref><ref>{{cite journal\|journal=At. Data & Nucl. Data Tables\|volume=94\|pages=781–806\|year=2008\|title=Nuclear half-lives for α -radioactivity of elements with 100 ≤ Z ≤ 130\|author=Chowdhury, P. Roy; Samanta, C. and Basu, D. N. \|doi=10.1016/j.adt.2008.01.003\|issue=6\|bibcode=2008ADNDT..94..781C\|arxiv = 0802.4161 }}</ref> The alpha-decay half-lives predicted for <sup>291–307</sup>119 are of the order of micro-seconds. The highest value of the alpha-decay half-life predicted in the quantum tunneling model with the mass estimates from a macroscopic-microscopic model is ~485 microseconds for the isotope <sup>294</sup>119. For <sup>302</sup>119 it is ~163 microseconds.

			==Target-projectile combinations leading to Z=119 compound nuclei==
			The below table contains various combinations of targets and projectiles which could be used to form compound nuclei with an atomic number of 119.

			{\|class="wikitable" style="text-align:center"

			!Target!!Projectile!!CN!!Attempt result
			\|-
			!<sup>254</sup>Es
			\|<sup>48</sup>Ca\|\|<sup>302</sup>Uue\|\|{{no\|Failure to date}}
			\|-
			!<sup>249</sup>Bk
			\|<sup>50</sup>Ti\|\|<sup>299</sup>Uue\|\|{{unk\|Planned reaction}}
			\|}<!--Please use {{yes\|Successful reaction}} for successes, thanks-->

			==Theoretical calculations on evaporation cross sections==
			The below table contains various targets-projectile combinations for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

			DNS = Di-nuclear system; σ = cross section

			{\|class="wikitable" style="text-align:center"
			\|-
			!Target!!Projectile!!CN!!Channel (product)!!σ <sub>max</sub>!!Model!!Ref
			\|-
			!<sup>254</sup>Es
			\|<sup>48</sup>Ca\|\|<sup>302</sup>Uue\|\|3n (<sup>299</sup>Uue)\|\|0.5 pb\|\|DNS\|\|<ref>{{cite journal\|arxiv=0803.1117\|doi=10.1016/j.nuclphysa.2008.11.003\|title=Production of heavy and superheavy nuclei in massive fusion reactions\|year=2009\|author=Feng, Z\|journal=Nuclear Physics A\|volume=816\|page=33\|last2=Jin\|first2=G\|last3=Li\|first3=J\|last4=Scheid\|first4=W\|bibcode=2009NuPhA.816...33F}}</ref>
			\|}

			==Extrapolated chemical properties==
			Ununennium is expected to behave normally for an alkali metal and exhibit a strong +1 [[oxidation state]]. However, the energetic properties of its [[valence electron]] would increase its first [[ionization energy]], making it less reactive than expected and more like [[potassium]] than [[caesium]] chemically. This would also decrease the [[metallic radius\|metallic]] and [[ionic radius\|ionic radii]] of ununennium.<ref name=EB>{{cite web\|author=Seaborg\|url=http://www.britannica.com/EBchecked/topic/603220/transuranium-element\|title=transuranium element (chemical element)\|publisher=Encyclopædia Britannica\|date=c. 2006\|accessdate=2010-03-16}}</ref> Ununennium is also predicted to be the first alkali metal to display the +3 oxidation state, due to the ionization energy of the 7p<sub>3/2</sub> electrons, which is predicted to be very low.<ref name=Haire/>

			==See also==
			*[[Extended periodic table]]

			==References==
			{{clear}}
			{{Reflist\|colwidth=30em}}

			{{Compact extended periodic table}}

			[[Category:Chemical elements]]
			[[Category:Alkali metals]]
			[[Category:Hypothetical chemical elements]]

en>Chjoaygame: Undid revision 508564398 by 72.91.3.216 (talk)undo vandalism

2012-08-24T02:23:43Z

Undid revision 508564398 by 72.91.3.216 (talk)undo vandalism

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The name of the author is Crysta. Montana is where he's always been living. Distributing production is when he lumber species living. Caravaning is some thing I've in dire straits years.<br><br>Here is my web-site ... http://nouveauclashofclanstriche.blogspot.com/ ([http://nouveauclashofclanstriche.blogspot.com/ nouveauclashofclanstriche.blogspot.com])