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What is the Periodic Table Showing? Periodicity

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. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).

   Use the drop menus or search box (below) to search & select from the 1400 entries in the database: 

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Year:  1871 PT id = 303, Type = formulation

Mendeleev's Predicted Elements

In large part, the success of the Mendeleev's analysis can be attributed to the gaps which he predicted would contain undiscovered elements with predictable properties. Mendeleev named these unknown elements using the terms eka, dvi & tri (1, 2 & 3 from the ancient Indian language of Sanskrit).

Mendeleev predictions include:

Image from van Spronsen

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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