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Atomic symbol - Cs
Atomic weight - 132.90543
Atomic number - 55
Electron configuration - 2-8-18-18-8-1
Oxidation states - +1
State of matter - solid
Light metal
Discovered in 1860 by Robert Bunsen and Gustav Kirchhoff
Boils at 671 .C, melts at 28.5 .C

Notes:
Cesium was the first element to be discovered spectroscopically. It is a
silvery-white metal that is extremely reactive and becomes a liquid in a warm
room. Cesium causes explosive reaction when dropped in water. Cesium atomic
clocks have been built. Cesium hydroxide is the most powerful base.

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