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![]() | Text and/or other creative content from Untriseptium was copied or moved into Extension of the periodic table beyond the seventh period. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
I read that
there cannot be any more element past this one (according to our current understanding of physics, of course). May a have an answer on this?
David Latapie (
✒ |
@)
14:36, 29 September 2006 (UTC)
Solve the equation for a nucleus of atomic number 138, noting that the 1s e- velocity now exceeds the speed of light in a vacuum c, which is a no-no for ordinary particles. Snarfevs 14:58, 9 October 2006 (UTC)
Does it make any sense to extrapolate the Bohr model to conclude that Z=137 is the limit? Seems that a QED analysis is required. After all, the "velocity of an electron" is non-sensical in an atom. This is a classical notion. 65.119.39.220 20:59, 17 October 2006 (UTC)
I think it make sense, if you speak in terms of energy levels instead of "velocities". The energy level of 1s orbital when Z=137, becomes of the order of the rest mass of the electron or positron (511 keV). The dense electric field near a nucleus with Z >= 137, easily produces electron/positron pairs, with electron capture and positron emission (see "virtual particle" and "pair production" ). Furthermore, the high Coulomb electric repulsive energy within the nucleus needs to be screened by more and more neutrons, which destabilises it (see Why nuclei decay?, see also the growing electrostatic term in the Bethe-Weizsäcker formula). Actually I suspect the effect may appear even before, say from Z > 128, because of the greater value for the Fine Structure Constant at high energy levels. Philip Dalleur Phdalleur 17:48, 10 December 2006 (UTC)
The result of the move request was: Technical close. Untriseptium is a redirect. See WP:RfD if you're serious, but I think I smell a troll. wbm1058 ( talk) 17:30, 21 October 2016 (UTC)
Untriseptium →
Feynmanium – Official name
108.65.81.208 (
talk)
17:03, 20 October 2016 (UTC)
![]() | This redirect does not require a rating on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||
|
![]() | Text and/or other creative content from Untriseptium was copied or moved into Extension of the periodic table beyond the seventh period. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
I read that
there cannot be any more element past this one (according to our current understanding of physics, of course). May a have an answer on this?
David Latapie (
✒ |
@)
14:36, 29 September 2006 (UTC)
Solve the equation for a nucleus of atomic number 138, noting that the 1s e- velocity now exceeds the speed of light in a vacuum c, which is a no-no for ordinary particles. Snarfevs 14:58, 9 October 2006 (UTC)
Does it make any sense to extrapolate the Bohr model to conclude that Z=137 is the limit? Seems that a QED analysis is required. After all, the "velocity of an electron" is non-sensical in an atom. This is a classical notion. 65.119.39.220 20:59, 17 October 2006 (UTC)
I think it make sense, if you speak in terms of energy levels instead of "velocities". The energy level of 1s orbital when Z=137, becomes of the order of the rest mass of the electron or positron (511 keV). The dense electric field near a nucleus with Z >= 137, easily produces electron/positron pairs, with electron capture and positron emission (see "virtual particle" and "pair production" ). Furthermore, the high Coulomb electric repulsive energy within the nucleus needs to be screened by more and more neutrons, which destabilises it (see Why nuclei decay?, see also the growing electrostatic term in the Bethe-Weizsäcker formula). Actually I suspect the effect may appear even before, say from Z > 128, because of the greater value for the Fine Structure Constant at high energy levels. Philip Dalleur Phdalleur 17:48, 10 December 2006 (UTC)
The result of the move request was: Technical close. Untriseptium is a redirect. See WP:RfD if you're serious, but I think I smell a troll. wbm1058 ( talk) 17:30, 21 October 2016 (UTC)
Untriseptium →
Feynmanium – Official name
108.65.81.208 (
talk)
17:03, 20 October 2016 (UTC)