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pre 1900 formulations
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The INTERNET Database of Periodic Tables

There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.

2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I

 pre 1900 formulations  1900 to 1949 formulations  1950 to 1999 formulations  2000 to 2009 formulations    Spiral formulations  3 dimensional formulations
 Data mapping periodic tables  Miscellaneous periodic tables  Books and reviews  non-chemistry periodic tables      All periodic tables




1931

Le Roy's Updated Periodic Table

Developed from Le Roy's 1927 formulation, this version appeared in an article, A modified periodic classification of elements adapted to the teaching of elementary chemistry: J. Chem. Educ., 1931, 8 (10), p 2052. DOI: 10.1021/ed008p2052.

The abstract notes that this formulation is based on the Deming PT of 1923. In the article Le Roy says that:

"this particular classification of elements has been used in connection with the elementary course in chemistry for the past three years at Doane College, and an earlier modification was used the two preceding years."

Thanks to Rene for the tip!

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Periodic Table, What is it showing?
Binary Compounds

© Mark R. Leach 1999-


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