Subshells Existing Out of the Periodic Table

[Neel Bonthala 2G]

In textbook number 1D.25, the question asks whether it is possible for the subshell 6f to exist. From my understanding, the periodic table only goes up to 5f as a subshell, yet the solutions say that 6f is a possible subshell. So my question is, can subshells that exist past the known elements in a theoretical sense? So is it possible for a 12s or a 13d subshell to exist?

[KatarinaReid_3H]

Yes, the periodic table only goes to 7s right now because we have never discovered elements any larger. Even several that are already on there are artificially prepared. Perhaps on another planet those elements exist. But yes, 6f, 12s, 13d could be possible.

[Olivia Smith 2E]

Those orbitals could also exist if you are artificially forcing a bunch of electrons onto an atom making more subshells than what generally appear in nature