Comment on Anon describes experience
brisk@aussie.zone 1 day agoHave a look through the history section. The concept of periodicity substantially predates the quantisation of the atom. The modern table certainly considers atomic orbitals to be key, but the groups were absolutely created based on common properties.
Ziglin@lemmy.world 16 hours ago
The table that does it that way is a complete mess but I guess it was a good idea and got some things right.
They first started doing it with valence shells in 1864, Mendeleev had a pretty close one based on atomic weights in 1871 and correctly predicted that there were missing elements based on valences + weights. The atomic numbers which determine the valences appear to have been discovered about 40 years later.
I guess you are correct but I think the question was about the modern table.