Etymology
The word "chlorine" comes from the Greek word "chloros," meaning "greenish yellow." This refers to the color of elemental chlorine gas.
Origin
Chlorine was first isolated by the Swedish chemist Carl Wilhelm Scheele in 1774. He did this by reacting manganese dioxide with hydrochloric acid. However, Scheele initially believed that he had discovered a new element, which he called "dephlogisticated marine acid air."
It wasn't until 1810 that the English chemist Humphrey Davy demonstrated that Scheele's "dephlogisticated marine acid air" was actually an element. Davy named the new element "chlorine" because of its greenish yellow color.
Meaning
Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a halogen, and is the second lightest halogen after fluorine. Chlorine is a highly reactive gas, and it is the most reactive of the halogens. It is used in a wide variety of applications, including water purification, bleaching, and the production of plastics.
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