Chlorine

Chlorine is an element used in industry and found in some household products.[1] Chlorine is the chemical element with the atomic number 17 and the symbol CI.[2] Chlorine is a yellowish green gas with an unpleasant odor, it causes irritation to the nose, throat, and lungs. Chlorine was invented in 1774 by Swedish chemist Carl Wilhelm Scheel, it is used in swimming pools because of it's ability to kill bacteria, small amounts are also used in drinking water, it is also used in paper, plastics, insecticides, cleaning fluids, and antifreeze.[3] Chlorine kills bacteria in water. It is widely used to purify water in swimming pools. In sunlight, chlorine can react with hydrogen to form hydrogen chloride. This could be explosive. This compound dissolves in water to become hydrochloric acid. This mixture has often been used as a bleach and disinfectant.[4] Humphry Davy confirmed chlorine as an element in 1810.[5] Chlorine is not found free in nature. It is commonly found in combination with sodium, forming sodium chloride (common salt). Chlorine is the most abundant member of the halogen family of chemical elements. Most chlorine is produced commercially by passing an electric current through a solution of water and sodium chloride. [6] Chlorine is an inorganic chemical.[7] Chlorine's atomic number is 17. It's symbol is CI and it's weight is 35.453.[8]Chlorine is the most common of the halogens.It very active and forms compounds with most elements.[9] media type="google" key="6120350643990410559&hl=en&fs=true" width="400" height="326"[11][10]
 * What is chlorine?**

Singh, Spencer http://bt.cdc.gov/agent/chlorine/basics/facts.asp [1] Resor, Mark [|http://en.wikipedia.org/wiki/Chlorine] [2] Resor, Mark[| www.worldbookonline.com][3] Broge, Alysha [|http://66.114.0.13:9797/MuseSessionID=8b8bca963cf1540627d5cd6f81a27f/MuseHost=www.worldbookonline.com/MusePath/wb/article?id=ar112460&st=chlorine]19 November, 2008 [4] Broge, Alysha[| http://66.114.0.13:9797/MuseSessionID=40ae877b627735562d2195f4bb722b77/MuseHost=www.oxfordreference.com/MusePath/views/ENTRY.html?entry=t81.e899&srn=9&ssid=120689028#FIRSTHIT] 19 November, 2008 [5] Broge, Alysha [|http://66.114.0.13:9797/MuseSessionID=8337c5a367c2e1a369ecfdd6aba42bd/MuseHost=www.fofweb.com/MusePath/Science/LowerFrame.asp?SID=5&iPin=NS40517&rID=1&SearchStyle=Keyword&keywordRelativeAND=chlorine&RecType=Essay&CurTab=All&RecCountVal=1&TopTermPrincCount=201&BioCount=26&ExpActCount=1&ImgCount=4&NwsCount=1] 19 November, 2008 [6] Singh, Spencer http://bt.cdc.gov/agent/chlorine/basics/facts.asp [7] Broge, Alysha http://periodic.lanl.gov/elements/17.html 19 November, 2008 [8] Broge, Alysha http://hyperphysics.phy-astr.gsu.edu/Hbase/pertab/Cl.html 19 November, 2008 [9] Broge, Alysha http://images.google.com/imgres?imgurl=http://www.site-found.com/images/swimming-pools.jpg&imgrefurl=http://www.site-found.com/swimming_pools.html&usg=__QGN1oyzLSrvBvdL4rs2Sn_sfWps=&h=337&w=480&sz=51&hl=en&start=14&um=1&tbnid=TGqwvzKbWQCWTM:&tbnh=91&tbnw=129&prev=/images%3Fq%3Dpools%26gbv%3D2%26um%3D1%26hl%3Den%26safe%3Dactive 19 November, 2008 [10] Broge, Alysha http://video.google.com/videoplay?docid=6120350643990410559&ei=SpUlSfOONoGE_AHqrrDxBg&q=bill+nye+the+science+guy+chlorine&hl=en 19 November, 2008
 * __References