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Cesium was first found by two German chemists, Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860. They found cesium by examining mineral water from a spectra-scope.They named it cesium after the blue lines in the scope.

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Melting point: 28.5 C or 83.19 F
Boiling point: 671 C  or 1240 F
Density: 1.93 grams per cubic centimeter
Abundance in crust: 0.00019

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Chemistry in its element: Listen to the exciting story behind each periodic table element in this podcast collection from Chemistry World

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Caesium or Cesium - Periodic Table of Videos

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Here it is - five grams of caesium in water... But did you know caesium (aka cesium) is also used to define the length of a second?

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Cesium - The most ACTIVE metal on EARTH!

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Mineral such as, Pollucite and Lepidolite is where cesium is found. It is found in liquid form in Canada and northern U.S.

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Cesium is a very cool, weird element. It is more expensive than gold to buy, the second most reactive metal on Earth, and liquid at 83 F. It is important in the modern life because it is so interesting and helps use in little ways that go a long distance. If Cesium didn't exist we wouldn't have this Drilling fluid. Without this drilling fluid we wouldn't be able to get oil as easily, which would slow down our demands for rubber and plastic. Cesium is very important in the modern day just in minute ways.

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Symbol: Cs
Atomic #: 55
Mass: 132.90545 u ± 2 × 10^-7 u

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http://www.rsc.org/periodic-table
http://www.chemistryexplained.com/elements/A-C/Cesium.html

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- Vacuum tubing
- Drilling Fluid
-Optical Glass
-Radiation monitoring equipment

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Cesium is the class of Metals.
Cesium is the Alkali metal group.

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there is only one natural occurring isotope which is Cesium-133.
There are a few artificial isotopes of cesium such as Cesium-137. Most artificial isotopes are radioactive. Cesium 137 creates nuclear fission which is used in power plants.