Abstract : A Periodic System was proposed for the elements 1-172 by Pyykkö (Phys. Chem. Chem. Phys. 2011, 13, 161) on the basis of atomic and ionic calculations. In it, the elements 121-138 were nominally assigned to a 5g row. We now perform molecular, relativistic four-component DFT calculations and find that the hexafluorides of the elements 125-129 indeed enjoy occupied 5g states.
