Pekka Pyykkö

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

Main article: 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. ^ a b "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. ^ a b c 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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