Superactinide group

In table 7 note is taken of the existence of the next rare-earth series containing 5g electrons. The predicted nature of this inner transition series, corresponding to the filling of the 5g and 6f electron shells, and which I characterized as a superactinide group, is described in an article I published in 1968 (Seaborg 1968). 

A periodic table that places the actinide elements and the transactinide elements in positions that best represent our present understanding is shown in fig. 5. A more futuristic periodic table that includes the unattainable superactinide group of elements with 5g and 6f electrons is shown in fig. 6. 

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