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]
After the 118 elements now known, Pekka Pyykkö predicts that the orbital shells will fill up in this order:
He also suggests that period 8 be split into three parts:
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]
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]
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]
After the 118 elements now known, Pekka Pyykkö predicts that the orbital shells will fill up in this order:
He also suggests that period 8 be split into three parts:
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]
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]