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What the name means: The name chlorine comes from the Greek khôros or chloros meaning light green.
Who identified chlorine?: A Swede called Carl Wilhelm Scheele was the first chemist to produce chlorine gas in 1774. However, Scheele did not realise that chlorine was a new element. It was Humphry Davy, in 1808 who convinced the other chemists that chlorine was, in fact, an element.
STP = standard temperature and pressure.
About chlorine: Fortunately, the yellow-green, poisonous diatomic gas, Cl2, does not occur in nature! This gas is extremely dangerous to health. During the First World War, in 1915, it was developed by Fritz Haber as one of the first chemical weapons. At that time it was known as bertholite and was, eventually, developed and used by the opposing side in that terrible conflict. In more recent years it has been added in very small quantities to water supplies and swimming pool water to keep the water free from harmful organisms, such as bacteria.
Chlorine occurs widely on Earth as the chloride ion (Cl-) in metal salts, such as sodium chloride. The chlorine ion is abundant in the salt water of the seas and oceans. It is also essential for the human body that needs to take in between 3g to 6g each day.
Chlorine belongs to the group of elements called the halogens. This word halogen is probably a mistake made in the 18th century in translating from the Greek word meaning "making a salt with a metal".
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