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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 Table formulations from the year 1922:

1922   Bohr's System
1922   Discovery of Hafnium
1922   Aston's Periodic Table of The Elements


1922

Bohr's System

Niels Bohr's system of 1922 (Theory of Spectra and Atomic Constitution, Cambridge University Press) and as reproduced by van Spronsen:

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1922

Discovery of Hafnium

Hf

Hafnium, atomic number 72, has a mass of 178.49 au.

Hafnium was first isolated in 1922 by D. Coster and G. von Hevesy.

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1922

Aston's Periodic Table of The Elements

ISOTOPES F.W. ASTON, M.A., D.S.C., A.I.C., F.R.S., London, 1922, Edward Arnold & Co.

Harry F. Tasset writes:

"Francis Aston was a chemist and a physicist who pioneered the discovery of the isotopes. He was a Fellow of the Royal Society and worked with J.J. Thomson. He started his work with the mass spectrometer. His periodic table was published in 1922 and is remarkable because it was one of the first attempts to group the rare earth elements. His success in separating the isotopes was rewarded with the Nobel Prize in Chemistry in 1922."

Click image to enlarge:

Thanks to Harry F. Tasset for the tip and info!

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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