21 Facts About Caesium

Caesium is a chemical element with the symbol Cs and atomic number 55.

Caesium has physical and chemical properties similar to those of rubidium and potassium.

Caesium fluoride is a hygroscopic white solid that is widely used in organofluorine chemistry as a source of fluoride anions.

Caesium fluoride has the halite structure, which means that the Cs and F pack in a cubic closest packed array as do Na and Cl in sodium chloride.

Caesium is then extracted from pollucite primarily by three methods: acid digestion, alkaline decomposition, and direct reduction.

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Caesium was the first element to be discovered with a spectroscope, which had been invented by Bunsen and Kirchhoff only a year previously.

Caesium was not recognized as a high-performance industrial metal until the 1950s.

Caesium is used as a source of positive ions in secondary ion mass spectrometry .

Caesium-based atomic clocks use the electromagnetic transitions in the hyperfine structure of caesium-133 atoms as a reference point.

Caesium clocks regulate the timing of cell phone networks and the Internet.

Caesium is important for its photoemissive properties, converting light to electron flow.

Caesium fluoride enjoys a niche use in organic chemistry as a base and as an anhydrous source of fluoride ion.

Caesium has been used in thermoluminescent radiation dosimetry : When exposed to radiation, it acquires crystal defects that, when heated, revert with emission of light proportionate to the received dose.

Caesium-137 is a radioisotope commonly used as a gamma-emitter in industrial applications.

Caesium-137 has been employed in a variety of industrial measurement gauges, including moisture, density, levelling, and thickness gauges.

Caesium-137 has been used in hydrologic studies analogous to those with tritium.

Caesium nitrate is used as an oxidizer and pyrotechnic colorant to burn silicon in infrared flares, such as the LUU-19 flare, because it emits much of its light in the near infrared spectrum.

Caesium metal has been considered as the working fluid in high-temperature Rankine cycle turboelectric generators.

Caesium salts have been evaluated as antishock reagents following the administration of arsenical drugs.

Caesium metal is one of the most reactive elements and is highly explosive in the presence of water.

Caesium hydroxide is a very strong base, and will rapidly corrode glass.