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.
|Periodic Table, What is it showing?||
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