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: Dr Mark R Leach.
Use the buttons below to select from the 1000+ Periodic Tables in the database:
Discovery of Lanthanum
Lanthanum, atomic number 57, has a mass of 138.905 au.
Lanthanum was first observed or predicted in 1838 by G. Mosander and first isolated in 1841 by G. Mosander.
Chronology of chemically the splitting of ceria (mixed oxides) into the pure rare-earth metals:
From: CRC Handbook on the Physics and Chemistry of Rare Earths, Chapter 248. Accommodation of the Rare Earths in the Periodic Table: A Historical Analysis
© Mark R. Leach 1999-
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