The Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence number of 3. The element has 3 energy levels. Chlorine exists as a greenish-yellow gas at normal temperatures and pressures. Chlorine is second in reactivity only to fluorine among the halogen elements. Chlorine is a nonmetal. It is estimated that 0.045% of the earth's crust and 1.9% of sea water are …showed first 75 words of 1165 total…

…showed last 75 words of 1165 total…Conclusion         In conclusion chlorine is a very wonderful element. Chlorine has hundreds of compounds. If we did not have these compounds we would not have clean water, we would have an insect problem, we could not make many important compounds that are used in medicine, and some of the battles in World War I might have been lost if it were not for chlorine. Our world would not be the same if not for chlorine.