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Cesium's class is Metals

Cesium is also part of the alkali metals

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Cesium is found in the minerals pollucite and lepidolite.

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132.905

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55

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Cs

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Cesium - The most ACTIVE metal on EARTH!

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http://education.jlab.org/itselemental/ele055.html

http://www.rsc.org/periodic-table/element/55/caesium

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- Drilling fluid
- Special optical glass
- Catalyst promoter
- Vacuum tubes
- Radiation monitoring equipment

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Cesium has 40 known isotopes but only 133Cs is stable

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45th most abundant in the earth's crust

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1.93 grams per cubic centimeter

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83.19°F (28.44°C)

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1240°F (28.44°C)

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Cesium or caesium was discovered by Robert Bunsen and Gustav Kirchhoff in 1860 in Heidelberg, Germany while they were analyzing the spectrum of mineral water. Cesium was the first element to be discovered using a spectroscope. Bunsen and Kirchhoff named cesium after the blue lines they observed in its spectrum. Caesium (cesium) is a Latin word that means "sky blue".