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Atomic symbol - Cl
Atomic weight - 35.4527
Atomic number - 17
Electron configuration - 2-8-7
Oxidation states - .1, +5, +7
State of matter - gas
Discovered in 1774 by Carl Wilhelm Scheele
Boils at -35 .C, freezes at -101 .C

Chlorine is very poisonous because of its great activity. Also because of its
activity it is not found free in nature. Chlorine is the most abundant
halogen. Chlorine is found in seawater, rock salt beds, human gastric
jucies. Practically all chlorine comes from the electrolysis of brine, or a
concentrated solution of salt. Chlorine has a sharp, disagreeable odor that
attacks the skin and mucous membranes of the nose and throat. Much chlorine is
used to bleach wood pulp for the paper industry and cotton and linen fabrics.
Tap water is chlorinated to kill bacteria and likewise swimming pools.

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