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How and when was chlorine discovered?

In 1774, Swedish pharmacist Carl Wilhelm Scheele placed drops of hydrochloric acid onto a piece of manganese dioxide and saw a greenish-yellow gas form.

In 1810, that greenish-yellow gas was proven to be an element by English chemist Sir Humphrey Davy, who created the name “chlorine” from the Greek word “khloros,” meaning greenish-yellow.

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