It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite. Caesium-137, a fission product, is extracted from waste produced by nuclear reactors. It has the largest atomic radius …

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Caesium gets its name from the Greek for heavenly blue. Not for its eyes (it's only an element!) but less romantically for the appearance of its emission spectrum in the spectroscope.

Nov 12, 2025 · cesium chemical element Also known as: Cs, caesium Emeritus Professor of Chemistry, Michigan State University, East Lansing, Mich. James L. Dye

May 24, 2022 · Cesium (or caesium) is a soft, shiny, pale gold metal with the chemical symbol Cs and atomic number 55. It is the most electropositive and least electronegative element using the Pauling …

Caesium is considered the first element who was discovered spectroscopically in 1860 by Robert Bunsen and Gustav Kirchhoff. They also derived its name from Latin caesius ‘’sky-blue’’ due to the …

History From the Latin word caesius, sky blue. Cesium was discovered spectroscopically in 1860 by Bunsen and Kirchhoff in mineral water from Durkheim. Sources Cesium, an alkali metal, occurs in …

Apr 8, 2020 · Caesium is a chemical element with an atomic number of 55 in the periodic table of elements. It’s the 45th most abundant element in Earth’s crust.

Caesium is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C, which makes it ...

This WebElements periodic table page contains the essentials for the element caesium