Carl Wilhelm Scheele was a German chemist born in 1742. He achieved a long string of scientific breakthroughs in his life, but rarely received any credit for his discoveries. Whether this was because of bad luck or some form of incompetence is a matter of opinion. There is no doubt that Scheele was brilliant, but each of his projects seemed to suffer from one grave misstep that prevented him from benefitting.
Scheele’s discovery of oxygen came three years before Joseph Priestley did, but he took six years to publish his findings. By then, Joseph Priestley had already published his experimental data and conclusions concerning oxygen. Before the gas was named “oxygen”, Scheele called it “fire air” because it seemed to support combustion. Scheele also found that air was a mixture of “fire air” and “foul air”, one of which was breathable and the other not.
Scheele went on to discover at least six more elements—barium, chlorine, molybdenum, manganese, nitrogen, and tungsten— for which he received no recognition. In the case of chlorine, Scheele thought it was an oxide obtained from hydrochloric acid, and called it ‘muriaticum’. It was some four decades later that Sir Humphrey Davy ascertained that muriaticum didn’t contain any oxygen and was in fact an element. Davy gave it the name chlorine. As for barium, Scheele knew it was an element but he was not able to isolate it. It was again Humphrey Davy who isolated the metal. The same with molybdenum. Scheele stated firmly that the mineral molybdena was unique and not an ore of lead. He proposed, correctly, that it contained a distinct new element and suggested the name molybdenum. However, it was Peter Jacob Hjelm who successfully isolated molybdenum and got the credit. Scheele’s run of poor luck continued with manganese, an element he identified but was not able to extract.
The one discovery that Scheele went down in history for was one that ended up inadvertently killing many people. Read the story of Carl Wilhelm Scheele and his many discoveries at Amusing Planet. -via Strange Company