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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 Select or Search the 1400 entries in the database: 

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Year:  1989 PT id = 463, Type = formulation

Laing's Modification of The Periodic Table of the Chemical Elements

Laing's modification of the periodic table. This arrangement has the lanthanide series (La to Lu) deliberately aligned with La below Y in Group 3 and with Ce below Zr in Group 4.

This places Pm below Tc, thus linking their common non-existence in Nature.

From Michael Laing's paper: A Revised Periodic Table with the Lanthanides Repositioned, Found. Chem. (2005) 7: 203–233

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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