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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1100 Period Tables in the database:

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Schwarz & Rich's Periodic Table

W. H. Eugen Schwarz & Ronald L. Rich, Theoretical Basis and Correct Explanation of the Periodic System: Review and Update, J. Chem. Educ. 2010, 87, 4, 435-443. DOI:

Periodic table, representing some aspects of the periodic system of chemical elements (mainly to support the discussions in [the attached] article, perhaps not for the classroom):

Note that the richness of chemistry sometimes prevents clear-cut classifications and assignments.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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