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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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Periodic Tables from the year 1944:

1944   Müller's Tree System
1944   Discovery of Americium
1944   Discovery of Curium


Müller's Tree System

In 1944 Müller produced a formulation based on Darwin's tree of life (from van Spronsen):

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Discovery of Americium


Americium, atomic number 95, has a mass of 243 au.

Synthetic radioactive element. It is used in smoke detectors, and so – surprisingly – is present most houses and buildings.

Americium was first observed in 1944 by G. T. Seaborg, R. A. James, O. Morgan and A. Ghiorso.

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Discovery of Curium


Curium, atomic number 96, has a mass of 247 au.

Synthetic radioactive element.

Curium was first observed in 1944 by G. T. Seaborg, R. A. James and A. Ghiorso.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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