The INTERNET Database of Periodic Tables
There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
Periodic Table of Ions
From Concept of Chemical Periodicity: from Mendeleev Table to Molecular Hyper-Periodicity Patterns E. V. Babaev and Ray Hefferlin, here.
"One intriguing problem that arises from with the periodic table of atoms is the possibility of constructing periodic systems of ions, V. K. Grigorovich, Periodic Law of Mendeleev and Electronic Structure of Metals, Nauka Publ.: Moscow, 1966 (in Russian). An atom can be completely or partially ionized to a cation by removing electrons or transformed into an anion by the addition of new electrons. The energy required for a few consecutive ionisations of atoms is plotted against the atomic number. One can see that the curves are periodic, and hence it is possible to construct periodic tables for mono-, di-, and multi- charged cations. If we look at the dispositions of the maxima and minima of the curves and compare them with those for atoms, it becomes evident that the magic numbers of electrons for ions are the same as for neutral atoms. Therefore, the number of electrons (but not the charge of the nucleus) is responsible for the periodicity of ions."
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