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Channel: wikipedia tts
Date: 25/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Extended_periodic_table


00:03:29 1 History
00:04:31 1.1 Structure of an extended periodic table
00:05:31 1.1.1 Aufbau model
00:06:16 1.1.2 Pyykkö model
00:07:23 1.1.3 Fricke model
00:09:11 1.2 Attempts to synthesize undiscovered elements
00:09:31 1.2.1 Ununennium
00:10:55 1.2.2 Unbinilium
00:11:04 1.2.3 Unbiunium
00:12:34 1.2.4 Unbibium
00:12:45 1.2.5 Unbiquadium
00:12:58 1.2.6 Unbipentium
00:16:44 1.2.7 Unbihexium
00:21:04 1.2.8 Unbiseptium
00:21:37 1.3 Possible natural occurrence
00:25:10 2 Predicted properties of eighth-period elements
00:26:23 2.1 Chemical and physical properties
00:27:20 2.1.1 Elements 119 and 120
00:28:11 2.1.2 Superactinides
00:28:20 2.1.3 Elements 157 to 166
00:29:16 2.1.4 Elements 167 to 172
00:29:48 2.1.5 Beyond element 172
00:31:02 2.2 End of the periodic table
00:33:36 2.2.1 Feynmanium and elements above the atomic number 137
00:35:00 2.2.1.1 Bohr model
00:35:10 2.2.1.2 Relativistic Dirac equation
00:36:15 2.3 Nuclear properties
00:43:56 2.3.1 Magic numbers and the island of stability
00:49:27 2.3.2 Predicted decay properties of undiscovered elements
00:51:39 2.4 Electron configurations
00:53:40 3 See also
00:53:59 4 References
00:54:43 5 Further reading
00:54:58 6 External links
00:55:19 137, on the grounds that the relativistic Dirac equation predicts that the ground-state energy of the innermost electron in such an atom would be an imaginary number. Here, the number 137 arises as the inverse of the fine-structure constant. By this argument, neutral atoms cannot exist beyond untriseptium (alternatively called "feynmanium"), and therefore a periodic table of elements based on electron orbitals breaks down at this point. However, this argument presumes that the atomic nucleus is pointlike. A more accurate calculation must take into account the small, but nonzero, size of the nucleus, which is predicted to push the limit further to Z ≈ 173.
00:56:04 Bohr model
00:57:12 Relativistic Dirac equation
01:00:25 184 and uranium with californium gives effective Z
01:00:52 Nuclear properties
01:01:01 Magic numbers and the island of stability
01:02:04 126 as a closed proton shell. In this region of the periodic table, N
01:02:12 196, and N
01:03:12 126, 138, 154, and 164 and N
01:04:04 228 isotones and elements 152-168, respectively. On the other hand, the same analysis suggests that proton shell closures may be relatively weak or even nonexistent in some cases such as 354126, meaning that such nuclei might not be doubly magic and stability will instead be primarily determined by strong neutron shell closures. Additionally, due to the enormously greater forces of electromagnetic repulsion that must be overcome by the strong force at the second island (Z
01:05:11 130.Beyond element 164, the fissility line defining the limit of stability with respect to spontaneous fission may converge with the neutron drip line, posing a limit to the existence of heavier elements. Nevertheless, further magic numbers have been predicted at Z
01:05:33 308, 406, 524, 644, and 772, with two beta-stable doubly magic nuclei found at 616210 and 798274; the same calculation method reproduced the predictions for 298Fl and 472164. Although additional stability toward alpha decay and fission are predicted for these nuclei, with half-lives up to hundreds of microseconds for 616210, there will not exist islands of stability as significant as those predicted at Z
01:06:42 Predicted decay properties of undiscovered elements
01:07:28 184 and N
01:08:51 Electron configurations
01:09:16 See also



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SUMMARY
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An extended periodic table theorizes about chemical elements beyond those currently known and proven up through oganesson, which completes the seventh period (row) in the periodic table at atomic number (Z) 118.
If further elements with higher atomic numbers than this ar ...