The INTERNET Database of Periodic Tables
|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|
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!
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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