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 Cesium
Cesium (or caesium), atomic number 55, has a mass of 132.905 au.
Cesium is a Group 1 element, and these are often referred to as the "alkali metals".
Cesium was first observed or predicted in 1860 by R. Bunsen and R. Kirchhoff and first isolated in 1882 by C. Setterberg.
© Mark R. Leach 1999-
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