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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 hold information on periodic tables, the discovery of the elements and elucidation of atomic weights (and more).

Use the drop menus or search box (below) to search & select from the more than 1350 Period Tables in the database: 

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Year:  1959 PT id = 1160, Type = formulation review

Mendoza's Neuvo Sistema Periodico

A memorial work, Ley De Configuraciones Electronicas, published posthumously in 1965 to honor Oswaldo Baca Mendoza (1908–1962 Cusco, Peru) and his 1959 Neuvo Sistema Periodico. Download the full PDF file (in Spanish).


Click to enlarge:

Thanks to Julio Gutierrez Samanez for the infomaton, etc.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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