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 * 1) Chlorine

The Discovery of Chlorine!
 Chlorine was discovered in 1774 by a man named Carl Scheele. He did not recognise that it was an element. He believed it contained was a compound that contained oxygen and not an element. It was not until 1810 that a man named Sir Humphrey Davy insisted it was an element that it was added to the periodic table.

Where Is Chlorine?
 Chlorine on earth is found in the salt that is mixed with the ocean water and is often found in salt mines. it does not exist in its pure form in nature. It usually bonds with sodium when it is found. It can be made into its pure form but only in a lab. It was first discovered by Scheele in Uppsala, Sweden in his laboratory. Sir Humphrey Davy did his research in Great Britain.

Physical Properties
 Freezing Point- Boiling Point: 239.25K -33.9C Melting Point:-100.98C Appearance: Chlorine is a greenish yellow gas. Chlorine in gas form. Other Properties: It is nonflammable. Atomic mass average is 35.453amu.

Most Common State:
Raw natural Sea Salt. It contains chlorine. The most common state for chlorine is sodium chloride (NaCl) in sea salt.

Rare or Common:
Chlorine is quite common because it is all throughout the sea and and is found with sodium another common element.

Isotopes:
Chlorine 35:75.53% abundance Chlorine 37:24.4% abundance. Chlorine has seven radioactive isotopes. That are not found in nature.

Modern Day Uses:
 Chlorine today is used in a whole host of industrial and household products. Some include- -creating paper -Plumbing pipes; -Medicines; -Seat belts; -Household bleach; -Rocket fuel; -Blood bags; -Computers; -Tap water; -Bullet-resistant vests -Cleaning products(disinfectant) -purifier(usually water)

Fun Facts:
The name Chlorine comes from the Greek word //Khloros// meaning "greenish  <span style="color: rgb(185, 224, 26)">  <span style="color: rgb(227, 241, 30)"><span style="color: rgb(151, 224, 26)"><span style="color: rgb(185, 224, 26)">ye  llow". Chlorine gas was used during WWI as a gas attack. It was responsible for thousands of deaths during the war. In liquid form it burns the skin and as a gas it damages the lungs and severe cough attacks. Its where the phrase " cough up a lung" literally comes into play.

Classification:
Chlorine is a Non-Metal. It is in group 7A aka the Halogens. media type="file" key="Cl-jingscreencast.WCH.swf"