Symbol	Cl	Atomic radius: pm	99	Fusion: kJ/Mole	6.4
Name	Chlorine	Ionic radius: pm	(-1)181	Boiling point: °C	-34
Atomic number	17	Electron affinity	3.61	Melting point: °C	-102
Atomic weight	35.45	1st  ion potential	12.97	Specific Heat Cap: J/(g K)	0.48
Classification	Non-metal	Natural form	Gas(Cl2)	Thermal Cond: W/(cm K)	<0.001
Configuration	[Ne]3s2p5	Crystal structure	-	Electrical Cond	-
Oxidation states	+/-1,3,5,7	Density	3.21	Abundance: mg/kg-crust	145
Electronegativity	3.16	Vaporization: kJ/Mole	20.41
Chlorine was first prepared from muriatic (hydrochloric) acid and manganese dioxide in 1774 by Carl Wilhelm Scheele.  It was considered a compound until Sir Humphrey Davy showed in 1810 that it could not be decomposed and that muriatic acid consists of two simple substances: hydrogen and a true element that he named chlorine.			Uses - bleach, PVC pipe, water purification, cleaning compounds