Cesium

=**Cesium**=
 * By: Chris**


 * Atomic Number: 55**.

 Protons: 55 Electrons: 55 Neutrons: 78 Average Atomic Mass: 132.905 Number:55

Protons:55

Electrons:55

Neutrons:132


 * Isotopes: Cs-134, Cs-135, and Cs-137**

 Discovery: Cesium was discovered in 1861 by German chemists, Robert Bunsen (1811-1899) and Gustav Kirchoff (1824-1187). The German chemists found this element using a method of analysis they had just invented, Spectroscopy. Spectroscopy is the process of analyzing light produced when an element is heated. Isotopes:only one:133cs


 * Name: Robert Bunsen and Gustav Kirchoff were studying a sample of mineral water taken from a spring. They saw spectral lines for Sodium, Potassium, Lithium, Calcium, and Strontium. After Bunsen and Kirchoff removed all elements from there sample, they were surprised to find two beautiful blue lines in the spectrum of empty spring water. It contained an unknown element. Busen suggested the element should be called cesium from latin caesius meaning "sky blue" and also cesium is called caesium.**


 * Uses: Cesium is used as a getter in bulbs or evacuated tubes, and photoelectric cell devices (devices for charging sunlight into electric energy).**


 * Interesting Facts** : **Cesium is the most highly reactive in all metals, cesium is so reactive that it will burst into flames in air, and explodes when touched by water. Also it powers atomic clocks.**

media type="youtube" key="5aD6HwUE2c0" height="340" width="560"** Cesium
 * Video:
 * Sources**
 * Photo: http://www.americanelements.com/ingot.jpg
 * Video: http://www.youtube.com/watch?v=5aD6HwUE2c0&feature=player_embedded
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