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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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Periodic Tables from the year 1915:

1915   Crehore's Periodic System
1915   Ramsay's The Elements Arranged in The Periodic System (with movable flap)

Year:  1915 PT id = 586

Crehore's Periodic System

[Part of] Crehore's periodic system, with the electronic configurations of the atoms, from Crehore, Gyroscopic Theory, p 323 (1915).

Crehore adopted Rydberg's ordinal number, implying the existance of two elements between hydrogen and helium.

Note the absence of groups VI and VII and that beryllium is shown as "Gl", glacinium.

From H. Kragh, Resisting the Bohr Atom, Perspectives in Physics, 13, (2011), 4-35:

Thanks to Eric Scerri for the tip!
See the website and Eric's Twitter Feed.

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Year:  1915 PT id = 1233

Ramsay's The Elements Arranged in The Periodic System (with movable flap)

From pages 220 & 221 of William Ramsay's book The Gases of The Atmosphere, McMillan (1915) comes a periodic table with a fold (or flap) that can be moved from page 220 to 221:

This periodic table is available as a Project Gutenberg ebook. The HTML version gives this dual representation:

Thanks to John Marks for the tip!

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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