Pekka Pyykkö Explained
Veli Pekka Pyykkö (born 12 October 1941)[1] is a Finnish academic. He was professor of Chemistry at the University of Helsinki.[1] From 2009 - 2012, he was the chairman of the International Academy of Quantum Molecular Science. He is known for his extension to the periodic table of elements,[2] [3] known as the Pyykkö model.[4]
Pyykkö has also studied the relativistic effects present in heavy atoms and their effects in NMR.[5]
Pyykkö model
After the 118 elements now known, Pekka Pyykkö predicts that the orbital shells will fill up in this order:
- 8s,
- 5g,
- the first two spaces of 8p,
- 6f,
- 7d,
- 9s,
- the first two spaces of 9p,
- the rest of 8p.
He also suggests that period 8 be split into three parts:
- 8a, containing 8s,
- 8b, containing the first two elements of 8p,
- 8c, containing 7d and the rest of 8p.[6]
| Pyykkö model |
|---|
| Pyykkö-displaced elements are in boldface |
| 8 | 119
Uue | 120
Ubn | 121
Ubu | 122
Ubb | 123
Ubt | 124
Ubq | 125
Ubp | 126
Ubh | 127
Ubs | 128
Ubo | 129
Ube | 130
Utn | 131
Utu | 132
Utb | 133
Utt | 134
Utq | 135
Utp | 136
Uth | 137
Uts | 138
Uto | 141
Uqu | 142
Uqb | 143
Uqt | 144
Uqq | 145
Uqp | 146
Uqh | 147
Uqs | 148
Uqo | 149
Uqe | 150
Upn | 151
Upu | 152
Upb | 153
Upt | 154
Upq | 155
Upp | 156
Uph | 157
Ups | 158
Upo | 159
Upe | 160
Uhn | 161
Uhu | 162
Uhb | 163
Uht | 164
Uhq | 139
Ute | 140
Uqn | 169
Uhe | 170
Usn | 171
Usu | 172
Usb |
| 9 | 165
Uhp | 166
Uhh | | 167
Uhs | 168
Uho |
| | s-block | g-block | f-block | d-block | p-block | |
The compact version:
Pekka Pyykkö correctly predicted the existence of chemical bonds between gold and the noble gas xenon, which is usually inert; this bond is known to occur in the cationic complex tetraxenonogold(II) . He also correctly predicted the existence of gold–carbon triple bonds.[7]
Notes and References
- Web site: Curriculum vitae. chem.helsinki.fi. 2012-04-25. 2012-05-28. https://web.archive.org/web/20120219013538/http://www.chem.helsinki.fi/~pyykko/curriculum/curriculum.html. 2012-02-19. dead.
- News: Roberts . Siobhan . Is It Time to Upend the Periodic Table? . 7 December 2019 . The New York Times . 27 August 2019.
- News: Kean . Sam . A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements . 7 December 2019 . Science . 30 January 2019.
- Atsumi . Michiko . SCCJ Cafe -Season 3-Theoretical Chemistry in Nordic (2)"The Extended Periodic Table − Pyykkö Model" . Journal of Computer Chemistry, Japan . 2013 . 12 . 2 . A18–A20 . 10.2477/jccj.2013-0008 . free .
- Vaara . Juha . Pyykkö . Pekka . 2003-02-15 . Relativistic, nearly basis-set-limit nuclear magnetic shielding constants of the rare gases He–Rn: A way to absolute nuclear magnetic resonance shielding scales . The Journal of Chemical Physics . 118 . 7 . 2973–2976 . 10.1063/1.1545718 . 0021-9606.
- Pyykkö . Pekka . A suggested periodic table up to Z≤ 172, based on Dirac–Fock calculations on atoms and ions . Physical Chemistry Chemical Physics . 13 . 1 . 161–8 . 2011 . 20967377 . 10.1039/c0cp01575j . 2011PCCP...13..161P . 31590563 .
- Scientific American June 2013, "Cracks in the Periodic Table". p. 72.
