Caesium, Cesium, on periodic table of the elements. Alkali metal named after Latin caesius, sky-blue. Symbol Cs, atomic number 55. Fission product caesium-137 is extracted from nuclear reactor waste.

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The periodic table of elements, or Mendeleev’s table, was created in 1869 by Russian chemist Dmitri Mendeleev. This table organizes all known chemical elements by their atomic number, or the ...