Finnish academic (born 1941)
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.
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
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Scientific American June 2013, "Cracks in the Periodic Table". p. 72.
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