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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.

Use the drop menus below to search & select from the more than 1300 Period Tables in the database: 

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Year:  1947 PT id = 1243

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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