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 Actinium
Actinium, atomic number 89, has a mass of 227 au.
Actinium was first isolated in 1902 by F. O. Giesel.
© Mark R. Leach 1999-
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