Internet Database of Periodic Tables
There are thousands of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
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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.
© Mark R. Leach 1999-
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