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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).

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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Year:  1952 PT id = 879, Type = element

Discovery of Einsteinium

Es

Einsteinium, atomic number 99, has a mass of 252 au.

Synthetic radioactive element.

Einsteinium was first observed in 1952 by A. Ghiorso et al.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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