Chlorine

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Chlorine

is a yellow gas with a sharp stench which is dangerous to breathe. It comprises 1.9% of the sea water. Its atomic number is 17, with the valance of 7-5-3-1 and the atomic weight of 35.453. It is not found free in nature, has many compounds and is solved in water. Once it is combined with metals, chloride is produced. Chlorine is used to purify water and make lime chloride to bleach fibers.[1]

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  1. Book Encyclopedia carpets from Iran, Mr. Ahmad Daneshgar