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The INTERNET Database of Periodic Tables

There are hundreds 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.

2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I

 pre 1900 formulations  1900 to 1949 formulations  1950 to 1999 formulations  2000 to 2009 formulations    Spiral formulations  3 dimensional formulations
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1979

Seaborg's "How the Periodic Table Evolved Over 40 Years" (1939 – 1979)

From the C&EN paper THE PERIODIC TABLE: Tortuous path to man-made elements 57, 1979, pp 46-52.

Until World War II, the three heaviest known elements – thorium, protactinium & uranium – were believed to be related to hafnium, tantalum & tungsten respectively. Similarly, elements 93 to 100 were expected to fit neatly into the periodic table:

Synthesis and study of the transuranic elements – neptunium & plutonium – indicated that these new elements were "cousins" of uranium and in 1944 should be placed into a new "uranide" group.

Subsequently (1944/45), Seaborg advanced the theory that elements heavier than actinium actually constitute a distinct "actinide" group that mirrors the lanthanide rare-earth group:

Finally, Seaborg postulated what a future periodic table, up to Z = 168, may look like:

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Periodic Table, What is it showing?
Binary Compounds

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