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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 1300 Period Tables in the database: 

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Year:  1982 PT id = 451, Type = formulation

Periodiska Systems Rätta Form

Hanno Essén's Periodiska Systems Rätta formulation of the Periodic Table, published in the International Journal of Quantum Chemistry vol. XXI pp.717-726 (1982).

Essén's formulation is a variant of the Janet Left-Step formulation of 1928:

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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