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1. chlorine is a gas
2. The only halogen lighter than the element chlorine is fluorine.

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https://www.chemicalsafetyfacts.org/chlorine-post/?tab=1&gclid=CLT6n4mEp9ACFQGmaQodJzwC1w

http://www.rsc.org/periodic-table/element/17/chlorine

http://www.lookchem.com/Periodic-Table/Chlorine/

http://education.jlab.org/itselemental/ele017.html

http://www.softschools.com/facts/periodic_table/chlorine_facts/194/

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Where it's found and in what form/ scientific information 

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Where it's found and in what form/ scientific information 

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Chlorine is found combined in other elements such as sodium, carnallite, and sylvite. One you may know is the combination between sodium and Chlorine (NaCl) or in the form of table salt. Chlorine is in the group Halogens, and is a non-metal.

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Chlorine does many things such as kills bacteria, treats drinking and swimming water, makes paper, paints, textiles, medicines and other products such as these  that's why it's important

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atomic number= 17
atomic mass= 35.453
symbol= CL

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The element Chlorine was discovered in 1774 by Wilhelm Scheele, but Sir Humphry an chemist gave chlorine its name by relating it to its color. Chlorine is a greenish yellowish color and the "Greek word Chloros" means yellow-green. So he named it this element Chlorine.

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Abundance in earths crust=
.017% Lanthanum
Density= 0.002898
melting point= -101.5 c
Boiling point= -34.04 c
Isotopes= 24 and 75