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Chlorine symbol Cl is a greenish-yellow gaseous element In group 17 of the periodic table chlorine is one of the halogens The atomic number of chlorine is 17 Chlorine is a greenish yellow gas which combines directly with nearly all elements It is a gas at normal temperature and pressure but because it is highly reactive it is not found as a gas in nature Instead it appears as naturally occurring organochlorine compounds and salts It is commonly found as NaCl solid or seawater The gas has an irritating odor and in large concentration is dangerous it was the first substance used as a poison gas in World War I 1914-1919 Other basic information includes the facts that chlorine melts at -101 C -1498 F and boils at -3405 C -2929 F at one atmosphere pressure the atomic weight of the element is 35453 Chlorine was first isolated in 1774 by the Swedish chemist C W Scheele who thought that the gas was a compound it was not until 1810 that the British chemist Sir Humphry Davy proved that chlorine was an element and gave it its present name Chlorine has a huge variety of uses as a disinfectant and purifier in plastics and polymers solvents agrochemicals and pharmaceuticals as well as an intermediate in manufacturing other substances where it is not contained in the final product Chlorine is used worldwide to purify water supplies as the ultimate defense against waterborne microbiological infection Modern day cholera epidemics in Peru China India or Africa exemplify the devastating consequences of poor sanitation Chlorine also plays a critical role in the production of thousands of commercial products Products reliant on chlorines unique properties include everyday household items such as household bleach and swimming pool disinfectants to bullet-resistant vests computer hardware silicon chips and automotive parts Chlorine and its derivatives are essential to many sectors including healthcare and the automotive electronic building and textile industries as well
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