CHLORINE

The chlorine is a chemical element of atomic placed number 17 in the group of the halogens of the periodic table of the elements. His symbol is A Cl.
The chlorine (of the Greek χλωρος, that it means " yellow greenish ") was discovered in his form biatómica in 1774 by the Swedish Carl Wilhelm Scheele, though the first electrolytic process for the production of chlorine was patented in 1851 by Charles Watt in Great Britain. In 1810 the chemical Englishman Humphry Davy demonstrates that it is a question of a chemical element and gives the name of chlorine due to his color.
It is a toxic yellow - greenish gas formed by molecules biatómicas.

Information obtained of www.wikipedia.org