Difference between revisions of "Ununseptium"
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|left = [[ununhexium]] | |left = [[ununhexium]] | ||
|right = [[ununoctium]] | |right = [[ununoctium]] | ||
| − | |above = [[Astatine| | + | |above = [[Astatine|At]] |
|below = — | |below = — | ||
|atomic-number = 117 | |atomic-number = 117 | ||
| − | |configuration = [Rn] 5f<sup>14</sup> 6d<sup>10</sup> 7s<sup>2</sup> 7p<sup>5</sup> | + | |configuration = [Rn] 5f<sup>14</sup> 6d<sup>10</sup> 7s<sup>2</sup> 7p<sup>5</sup><ref group=note>The electronic configuration is predicted on the basis of periodic trends.</ref> |
|CAS-number = 87658-56-8 | |CAS-number = 87658-56-8 | ||
}} | }} | ||
| − | '''Ununseptium''' (symbol: '''Uus''') is a [[chemical element]] in [[group 17]] of the [[periodic table]]. | + | '''Ununseptium''' (symbol: '''Uus''') is a purported [[chemical element]] in [[group 17]] of the [[periodic table]]. Its preparation was reported by a team from the [[Flerov Laboratory of Nuclear Reactions]] in April 2010, based on the fusion of [[berkelium-249]] with [[calcium-48]] nuclei:<ref>{{citation | first1 = Yu. Ts. | last1 = Oganessian | first2 = F. Sh. | last2 = Abdullin | first3 = P. D. | last3 = Bailey | first4 = D. E. | last4 = Benker | first5 = M. E. | last5 = Bennett | first6 = S. N. | last6 = Dmitriev | first7 = J. G. | last7 = Ezold | first8 = J. H. | last8 = Hamilton | first9 = R. A. | last9 = Henderson | first10 = M. G. | last10 = Itkis | first11 = Yu. V. | last11 = Lobanov | first12 = A. N. | last12 = Mezentsev | first13 = K. J. | last13 = Moody | first14 = S. L. | last14 = Nelson | first15 = A. N. | last15 = Polyakov | first16 = C. E. | last16 = Porter | first17 = A. V. | last17 = Ramayya | first18 = F. D. | last18 = Riley | first19 = J. B. | last19 = Roberto | first20 = M. A. | last20 = Ryabinin | first21 = K. P. | last21 = Rykaczewski | first22 = R. N. | last22 = Sagaidak | first23 = D. A. | last23 = Shaughnessy | first24 = I. V. | last24 = Shirokovsky | first25 = M. A. | last25 = Stoyer | first26 = V. G. | last26 = Subbotin | first27 = R. | last27 = Sudowe | first28 = A. M. | last28 = Sukhov | first29 = Yu. S. | last29 = Tsyganov | first30 = V. K. | last30 = Utyonkov | first31 = A. A. | last31 = Voinov | first32 = G. K. | last32 = Vostokin | first33 = P. A. | last33 = Wilk | title = Synthesis of a New Element with Atomic Number ''Z'' = 117 | journal = Phys. Rev. Lett. | volume = 104 | issue = 14 | page = 142502 | year = 2010 | doi = 10.1103/PhysRevLett.104.142502}}.</ref> |
| + | :{{Nuclide|Z=97|A=249}}({{Nuclide|Z=20|A=48}},3n){{Nuclide|Z=117|A=294}} ''t''<sub>½</sub> = 78({{su|p=+370|b=-36}}) ms | ||
| + | :{{Nuclide|Z=97|A=249}}({{Nuclide|Z=20|A=48}},4n){{Nuclide|Z=117|A=293}} ''t''<sub>½</sub> = 14({{su|p=+11|b=-4}}) ms | ||
| + | This claim has yet to be accepted by the [[IUPAC/IUPAP Joint Working Party on Discovery of Elements]] (JWP). | ||
| − | ==References== | + | ==Notes and references== |
| + | ===Notes=== | ||
| + | {{reflist|group=note}} | ||
| + | |||
| + | ===References=== | ||
{{reflist}} | {{reflist}} | ||
Latest revision as of 13:45, 27 December 2010
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Ununseptium (symbol: Uus) is a purported chemical element in group 17 of the periodic table. Its preparation was reported by a team from the Flerov Laboratory of Nuclear Reactions in April 2010, based on the fusion of berkelium-249 with calcium-48 nuclei:[1]
- 24997Bk(4820Ca,3n)294117Uus t½ = 78(+370-36) ms
- 24997Bk(4820Ca,4n)293117Uus t½ = 14(+11-4) ms
This claim has yet to be accepted by the IUPAC/IUPAP Joint Working Party on Discovery of Elements (JWP).
Notes and references
Notes
- Jump up ↑ The electronic configuration is predicted on the basis of periodic trends.
References
- Jump up ↑ Oganessian, Yu. Ts.; Abdullin, F. Sh.; Bailey, P. D.; Benker, D. E.; Bennett, M. E.; Dmitriev, S. N.; Ezold, J. G.; Hamilton, J. H., et al. Synthesis of a New Element with Atomic Number Z = 117. Phys. Rev. Lett. 2010, 104 (14), 142502. DOI: 10.1103/PhysRevLett.104.142502.
External links
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See also the corresponding article on Wikipedia. |
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