Chlorine
  Symbol:  Cl
Group #:  17
Group Name:  Halogens
Atomic #:  17Mass #:  35
Atomic Mass:  35.45
Electron Configuration:  1s2, 2s2, 2p6, 3s2, 3p5
 
Physical Properties:
Bpt:  -34.05 oCMpt:  -100.98 oC
Density:  0.00295 gml
Radioactivity:  36Cl
Color:  Yellowish Green
Odor:  Strong and Unpleasant
Hardness: None at 25 oC
Brittle:  None at 25 oC
Malleability: None at 25 oC
 
Chemical Properties:  (Click here for Demonstrations!! )
Chlorine is usually found combined with other elements.  Chlorine often combines with metals.  While combining with other elements, Chlorine is known to assist in the creation of salts.  Chlorine is highly reactive to hydrogen when exposed to the sunlight.  Chlorine's extreme reactivity to various elements easily allows scientists to synthetically reproduce the element.  The synthetic reproduction is made possible due to one electron that Chlorine is lacking.  This missing electron easily allows scientists to find an element that will combine with Chlorine.  Several toxix compounds can be mixed together to create Chlorine.
 
History:Chlorine was discovered by Karl Wilhelm Scheele, a Swedish chemist, in 1774.  Scheele thought that chlorine was an oxide of murium, or hydrochloric acid and discovered this greenish, yellow gas.  He did not, however, establish chlorine as an element by Humphrey Davy.Chlorine was named after the Greek word "Chloros", which means pale green.  Chlorine naturally occurs in several naturally existing compounds and salts, such as the water int he world's oceans.
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Uses:
Chlorine was used during World War I.   Chlorine was first introduced as a weapon on April 22, 1915 at Ypres by the Germans.  The results of this weapon were disastrous because gas oriented weapons had not yet been invented.  But, some compuunds of Chlorine are more dangerous and have replaced chlorine gas on the battlefield.  Thay are Phosgene, Chloropicirin, Lewsite, and Mustard gas.  The Chlorine gas was replaced because the reaction between Chlorine abd the conbining elements were more detrimental to the lives of the opposing country's army.  Chlorine is used as a purifier in plastics and polymers, solvents, agrochemicals and pharmaceuticals, as well as other substances.  Chlorine purifies water against waterborne icrobiological infection.
 
Reference:
T., Stacie. (1999, November 2). Chlorine, 1 (2p.). Retrieved March 15, 2000 from the world wide web:  http://www.polytech.k12.de/us/hs/webstaff/jlettier/pt/cl/chlorine.htm

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Ashley D.                                    Past Element Projects: Fall 1999
June 6, 2000