Name       : Cesium
Symbol     : Cs
Atomic #   : 55
Atom weight: 132.905
Melting P. : 28.40
Boiling P. : 669.3
Oxidation  : +1
Pronounced : SEE-zi-em
From       : Latin coesium "sky blue"; named for the characteristic blue
             lines of its spectrum
Identified : Robert Bunsen and Gustav Kirchoff in 1860
Appearance : Very soft, ductile, light gray metal
Note       : Reacts readily with most gasses
             
[Properties]

  Cesium is one of the Group-IA alkali metals. This group includes more
familiar active metals such as lithium (Li), sodium (Na), and potassium
(K). These have been called alkali metals because they react explosively
with water to produce a caustic metal hydroxide, or alkali, compound.
  Few people have ever seen a blob of pure cesium metal. Those who have
seen the solid form say it is a silvery white, soft, and ductile metal.
It is easily melted at 28.4 degrees, so it often exists as a liquid that
looks much like mercury. In fact, mercury is the only metal that has a
melting point lower than cesium.