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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 1100 Period Tables in the database:

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1909

Chemical News' Periodic Arrangement of the Elements

From Chemical News and Journal of Industrial Science, December 1909, a Periodic Arrangement of the Elements.

This formulation shows an element Np (mass 100 – Ogawa's nipponium), between Mo and Ru, a hypothesised element was later found to be the radioacive element technecium, discovered in 1937.

The formulation also has the Inactive Neutral Gases – the noble gases: St, RaEm, Z1 & Z2.

Many thanks to Sam Kidd for the tip!

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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