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Calcium metal may be combined with fused cesium chloride or electric current may be passed through a molten cesium compound. There are two methods used to prepare pure cesium.Nonradioactive cesium and its compounds are used for infrared flares, to make specialty glasses, and in beer brewing. The isotope Cs-137 is used in cancer treatments, to irradiate foods, and as a tracer for drilling fluids in the petroleum industry.

Cesium is used in atomic clocks, photoelectric cells, as a catalyst to hydrogenate organic compounds, and as a 'getter' in vacuum tubes.

Radioactive cesium presents a health hazard because of the radioactivity, not chemistry.

Non-radioactive cesium is not a nutritional requirement for plants or animals, but it's not particularly toxic, either.

Some radioisotopes are produced in nature by slow neutron capture within old stars or by the R-process in supernovae. Numerous artificial radioactive isotopes have been produced.

Only one stable isotope of cesium occurs naturally - cesium-133.

Francium is the most electronegative element according to the Pauling scale. According to the Allen scale of electronegativity, cesium is the most electronegative element. For all practical purposes, cesium is the most reactive metal known to man.

Although francium is predicted to be more reactive than cesium, based on its location on the periodic table, so little of the element has been produced no one knows for sure.

Cesium is the most alkaline of the elements and reacts explosively with water to produce cesium hydroxide (CsOH), a strong base that can eat through glass. The reaction with water is much more violent and energetic than the reaction between water and other alkali metals (e.g., sodium or lithium). Otherwise, the element would react with air or water.

Samples of cesium are kept in sealed containers, under an inert liquid or gas or in a vacuum.Although the official IUPAC name for the element is cesium, several countries, including England, retain the original Latin spelling of the element: caesium.This refers to the color of the line in the spectrum the chemists saw that tipped them off about the new element. The name for the element comes from the Latin word "caesius", which means "sky blue". German chemists Robert Bunsen and Gustav Kirchhoff discovered cesium in 1860 when analyzing the spectrum of mineral water.Although not a liquid at room temperature, if you hold a vial containing cesium in your hand, your body heat will melt the element into its liquid form, which resembles pale liquid gold.It is not as yellow as high-karat gold but has a warm color Gold is often listed as the only yellow-colored element.