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 …

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.

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

Dec 16, 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 …

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, …

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 ...

Caesium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1860. The origin of the name comes from the Latin word caesius meaning sky blue or heavenly blue. …

Caesium (IUPAC spelling; also spelled cesium in American English) 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 …

Cesium (also spelled caesium, chemical symbol Cs, atomic number 55) is a member of the group of chemical elements known as alkali metals. Soft and silvery gold in color, it is one of a …