Pekka Pyykkö

Veli Pekka Pyykkö (October 12, 1941) is a Finnish professor of Chemistry at the University of Helsinki. 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, called Pyykkö model.

Pekka Pyykkö predicts that the orbital shells will fill up in this order:

He also suggests that period 8 be split into three parts:

The compact version:

Pekka Pyykkö successfully predicted the possibility of a chemical bond between gold and the noble gas xenon, which is usually extremely 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.