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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:  2007 PT id = 937, Type = data misc

Extending the Periodic Table

The periodic table now extends to element 118, Oganesson, and scientists are attempting to go further. Below is part of a Segre chart, proton number on the y-axis and neutron number of the x-axis, from a report from the Japanese Superheavy Element Laboratory, RIKEN Nishina Center, RIKEN.

The diagram shows various nuclear reactions, for example: 232Th + 40Ar to make 272Hs.

Thanks to Larry Tsimmerman for the tip!

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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