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.
Use the buttons below to select from the 1000+ Periodic Tables in the database:
Discovery of Plutonium
Plutonium, atomic number 94, has a mass of 244 au.
Radioactive element: Pu is only found in tiny amounts in nature. Most samples are synthetic.
Plutonium was first observed in 1940 by Glenn T. Seaborg, Arthur C. Wahl, W. Kennedy and E.M. McMillan.
© Mark R. Leach 1999-
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