Periodic Table |
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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).
Periodic Tables from the year 1909 :
| 1909 | Chemical News' Periodic Arrangement of the Elements |
| 1909 | Garrett's The Periodic Law |
| Year: 1909 | PT id = 1032, Type = formulation |
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!
| Year: 1909 | PT id = 1106, Type = review |
Garrett's The Periodic Law
A book reviewing The Periodic Law by A.E. Garrett, pub. D. Appelton & Co (1909). This work shows the state of knowledge in the first decade of the 20th century.
René Vernon writes:
"On page 43 Garrett notes that, '[Thomas] Carnelley was the first English chemist to work out in detail the manner in which the properties of the elements are periodic functions of their atomic weights. His papers on this subject appeared in the Philosophical Magazine between the years 1879 and 1885.' "

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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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