Chlorines symbol is Cl.Chlorine is also used in pools,plastics,medicines,paper,textiles,paint and many more.

Symbol CI

Atomic Number 17

Atomic Mass 34.968852721

Melting Point 172.17

Boiling Point 239.18

Family Halogens

Density 3.21

Standard State Gas

# of electrons in outer shell 7

Used in pools,deadly gas,plastics,paper

Chlorine was dicovered in 1774 by a man named Carl William Scheele was mixing pyrolusite and hydrocholic acid together which formed a greenish yellow gas with a suffocating scent.He called it chlorine.

Chlorine is a green reactive gas,found in seawater and lakes.It strongly attaches to elements such as oxygen and can only be liberated by using other elements such as oxide or potassium dichromate. Chlorine is also extremely explosive.These characteristics make it useful in pools because it effectively kills bacteria.

Iodine is used to prevent thyroid gland problems andis an excellent germ killer. Fluoride is used to strengthenteeth. Bromine was used as an additive to leaded gasolineand can be used for photographic film.

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Chorine is used in pools because it kills bacteria inside the pool.chlorine was used as a deadly gas in World War One because it suffocated their enemies..

Polyhexanethylene is a non-chlorine alternative for swimming pools.It is effective because it fights microorganisms, it’s not effected byUltra violet rays like chlorine and can withstand temperature changes

http://www.howstuffworks.com

Brian KnappElements Of Chlorine,Grolier Educational, Sherman Turnpike1996,4-7,Danbury,Cnnecticut

DavidE.NewtonChemicalElements,U.X.L

199419-22,Farmington Hills

Chlorine