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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:  1947 PT id = 1243, Type = formulation

Science Service: Two Periodic Tables

A two-sided Science Service periodic table from 1947. The one is listed as "After Bohr", the other as "After Mendeleeff".

René Vernon writes:

"Here’s a slightly odd table (with two sides):

    1. The neutron is included in group 0.
    2. Argon is still A; niobium Cb
    3. There's a blank space for Pm (discovered 1945).
    4. The main groups are recognisable, with the exception of group 3 as B-Al-Sc-Y-La. The other side of the table lists B-Al as being analogous to Sc-Y-La, rather than Ga-In-Tl.
      The former option works better than the latter in terms of the quantitative smoothness of chemico-physical trend lines going down the group."

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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