Gahn, Johann

Even to J. G. Gahn and Scheele, phosphorus was a rarity. When Scheele first read the English translation of his treatise On air and fire, he found that Johann Reinhold Foxster had translated the word Gran as ounces instead of grains. Nine ounces of phosphorus, said Scheele, I have never yet seen (43). 

Manganese Mn 25 Johann Gahn Sweden Latin word "magnes" meaning "magnet ... 

It took chemists some time to discover the difference between manganese and iron. The two metals have very similar properties and often occur together in Earth s crust. The first person to clearly identify the differences between the two elements was Swedish mineralogist Johann Gottlieb Gahn (1745-1818) in 1774. 

Swedish mineralogist Johann Gotdieb Gahn discovers manganese. 

Phosphoric acid was discovered independently as a component of bone ash in 1770 by two Swedish chemists, Johann Gottlieb Gahn (1745-1818) and Karl Wilhelm Scheele (1742-1786). Four years later, Scheele discovered that the acid could be made by adding nitric acid to phosphorus. 

In 1751, Axel Fredric Cronstedt (1722-65) discovered the very similar metal, nickel Johann Gottlieb Gahn (1745-1818) isolated in 1774,... 

The recipe was secretly purchased and otherwise passed among a select number of entrepreneurs until finally in 1737, some 68 years after its initial discovery, the secret was sold to the French Academy of Sciences, which made it public. In 1769 Karl Scheele and Johann Gahn found phosphorus in bones, but it is remarkable that for a full century the only way to make this element involved the processing of human urine By the early 1800s, the manufacture of matches in England made the demand for phosphorus so great that European battlefields were being combed for human remains. Thankfully, it is now manufactured by the relatively... 

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