Pekka Pyykkö
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Veli Pekka Pyykkö (born October 12, 1941)[1] is a Finnish academic. He is 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 model
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.[5]
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.[5]
Template:Extended periodic table (by Pyykkö, 50 columns, periods 8–9)
The compact version:[5]
Pekka Pyykkö successfully predicted the possibility of a chemical bond 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 successfully predicted the possibility of a gold–carbon triple bond.[6]
References
- ^ a b "Curriculum vitae". chem.helsinki.fi. 2012-04-25. Archived from the original on 2012-02-19. Retrieved 2012-05-28.
- ^ Roberts, Siobhan (27 August 2019). "Is It Time to Upend the Periodic Table?". The New York Times. Retrieved 7 December 2019.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Scientific American June 2013, "Cracks in the Periodic Table". p. 72.
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