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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: 

  Or, Search by Text String:       
Year:  2026 PT id = 1396, Type = element structure review

Quest To Understand Where Atoms End

By Philip Ball in Chemistry World, who writes:

"There is no consensus. 'We have some models and theories [of atomic size] but none have been really amenable to experimental verification,' says Amin Alibakhshi at the Technical University of Dortmund in Germany. 'That’s why we have many different definitions, like van der Waals radii, covalent radii, and so on.' But is each of these definitions in the end a rather arbitrary attempt to carve up the smooth and continuous electron density so that it seems to have hard edges? Or might there be, after all, some deeper and more objective meaning to the size of an atom?"

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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