Jons Jakob Berzelius (1779-1848)
Berzelius was a Swedish chemist born, in Linkoping, in August 29th 1779, and died in Stockholm, in August 7th 1848. He is considered one the founders of modern Chemistry.
Bezelius graduated in Medicine, at Upsala, being later a teacher in Stockholm. In 1822, entered the French Institute and was responsible for the mineral classification according to its chemical composition. His studies in electrolysis led him to the basis of electrochemical theories. Determined the atomic weight of 43 elements. He isolated calcium, barium, strontium, silicon, titanium, zirconium and discovered selenium, thorium and cesium. He recognized the existence of isomers (in Organic Chemistry) and discovered the catalysis phenomenon.