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

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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Year:  1907 PT id = 1105, Type = formulation

Grouping of The Elements to Illustrate Refractivity

From C. Cuthbertson & E. Parr Metcalfe, Part III On The Refractive Indices of Gaseous Potassium, Zinc, Mercury, Arsenic Selenium and Tellurium, Phil. Trans. A: Mathematical & Physical Sciences, vol 207, pp135–148, 1907.

René Vernon writes:

"A curious periodic table which runs from group 12 on the left to group 13 on the right (see below). It seems to have done that way to bring out the pattern in multiples of refractivities i.e. x½ x 4 x 6 x10. The border around the elements in groups 15 to K-Rb-Cs in group 1 denotes this relatively strong regularity among the refractivity values. The L for iodine is a printer's error."

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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