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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 hold information on periodic tables, the discovery of the elements and elucidation of atomic weights (and more).

Use the drop menus or search box (below) to search & select from the more than 1350 Period Tables in the database: 

  Search by Text String:       
Year:  2022 PT id = 1234, Type = formulation spiral

Kudan's Periodic Law (Helix Form)

From Pavel V. Kudan, a specialist in mass-spectrometry and identification of compounds, who suggests a helical variant of the Periodic table. The graphical representation illustrates the Periodic Law and the following features of the Kudan’s periodic system:

    1. Four element periods (1, 2, 3, 4)
    2. Two element half periods (-,+)
    3. Twenty one element subgroups octet rule compatible (1a-8a, 2b-8b, 3c-8c)
    4. Small energy barriers between S and F, F and D, D and P elements (gray segments)
    5. Large energy barriers between P and S elements (black segments)
    6. Large energy barrier between He and Li (black segments)

(See also Kudan’s Left-Step Periodic Table)

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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