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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:  2019 PT id = 1069

Alexander Arrangement Unwrapped... and Rewrapped

In mid-2019 Roy Alexander – of the Alexander Arrangement – produced an intriguing new formulation in sketch form that shows the p, d & f blocks moving away from the s block in three dimensional space:

Roy has now expanded this into a full blown new formulation. (Click image to enlarge):

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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