That's because the periodic table is essentially about chemistry (i.e. about electron orbitals), not about nuclear physics (i.e. the atom's nucleus). For example it doesn't talk much about isotopes, aside from usually reporting the average atomic mass.

My point is that there are other ways of organizing the same information to perhaps reveal unexpected connections. From the same link, a 'physicists periodic table' - https://en.wikipedia.org/wiki/Alternative_periodic_tables#Th...

And really, i guess everything is physics if you get specific enough.