Symbol	Cs	Atomic radius: pm	265	Fusion: kJ/Mole	2.09
Name	Cesium	Ionic radius: pm	(+1)174	Boiling point: °C	671
Atomic number	55	Electron affinity	0.47	Melting point: °C	28
Atomic weight	132.9	1st  ion potential	3.89	Specific Heat Cap: J/(g K)	0.24
Classification	Alkali metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.36
Configuration	[Xe]6s1	Crystal structure	BCC	Electrical Cond	0.0489
Oxidation states	1	Density	1.93	Abundance: mg/kg-crust	3
Electronegativity	0.79	Vaporization: kJ/Mole	65.9
Cesium was discovered in 1860 by Robert Bunsen and Gustav Kirchoff.			Uses - photocells, IR lamps, removal of air traces in vaccuum tubes, ion propulsion systems,atomic clocks