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.
Pozzi Spiral Periodic Table
A spiral periodic table formulation constructed by E.C. Pozzi in 1937, from here.
Note the "Strong Positive, Strong Negative, Weak Positive and Weak Negative" corners:
© Mark R. Leach 1999-
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counter started in 2011