Chlorine

Chlorine is a yellow-green extremely reactive halogen gas
Chlorine discovery and first isolated by Carl Wilhelm Scheele (1774)
Chlorine was recognized as an element by Humphry Davy (1808)
Chlorine is too reactive to occur as the free element in nature but is very abundant in the form of its chloride salts
Chlorine is the second halogen, properties are intermediate between fluorine and bromine
Chlorine is a strong oxidising agent, reacting with most other elements
Chlorine has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine
The most common compound of chlorine, sodium chloride (common salt), has been known since ancient times
Chlorine is commercially produced from brine by electrolysis
Chlorine high oxidising potential has led to the development of commercial bleaches and disinfectants, and a reagent for many processes in the chemical industry
Chlorine is used in the manufacture of a wide range of consumer products, about two-thirds of them organic chemicals
Chlorine at high concentrations is extremely dangerous and poisonous for all living organisms, and was used in World War I as the first gaseous chemical warfare agent
As chloride ions, chlorine is necessary to all known species of life

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