Pekka Pyykkö in 1991.

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.[6]

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:[6]

Extended periodic table. P. Pyykkö, PCCP 2011, 13, 161. @RSC. Reprinted with permission.
Extended periodic table. P. Pyykkö, PCCP 2011, 13, 161. @RSC. Reprinted with permission.

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) (AuXe2+
4). He also correctly predicted the existence of gold–carbon triple bonds.[7]

References

  1. 1 2 "Curriculum vitae". chem.helsinki.fi. 2012-04-25. Archived from the original on 2012-02-19. Retrieved 2012-05-28.
  2. ↑ Roberts, Siobhan (27 August 2019). "Is It Time to Upend the Periodic Table?". The New York Times. Retrieved 7 December 2019.
  3. ↑ Kean, Sam (30 January 2019). "A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements". Science. Retrieved 7 December 2019.
  4. ↑ Atsumi, Michiko (2013). "SCCJ Cafe -Season 3-Theoretical Chemistry in Nordic (2)"The Extended Periodic Table − Pyykkö Model"". Journal of Computer Chemistry, Japan. 12 (2): A18–A20. doi:10.2477/jccj.2013-0008.
  5. ↑ 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. doi:10.1063/1.1545718. ISSN 0021-9606.
  6. 1 2 3 Pyykkö, Pekka (2011). "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. Bibcode:2011PCCP...13..161P. doi:10.1039/c0cp01575j. PMID 20967377. S2CID 31590563.
  7. ↑ Scientific American June 2013, "Cracks in the Periodic Table". p. 72.
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