 This ninth period would be similar to the second and third period in that it is expected to have no transition metals.Element 172, the last period 8 element, is expected to be the first noble gas after oganesson (the last period 7 element).Beyond it another long transition series like the superactinides should begin, filling at least the 6g, 7f, and 8d shells (with 10s, 10p1/2, and 6h11/2 too high in energy to contribute early in the series).