When was chlorine discovered?

In those days, Scheele was not aware of the fact that he had discovered one of the 92 natural elements that would be regrouped - about a century later - by Dmitri Mendeleev in his famous Periodic Table of the Elements.

Wilhelm Scheele was a clever chemical and pharmaceutical scientist. He also discovered the gases oxygen and nitrogen and the metals barium, manganese, molybdenum and tungsten.