Hjelm, Peter Jacob

Hjelm, Peter Jacob (1746-1813) Swedish chemist who in 1782 discovered the element molybdenum in a sample of molybdenite sent to him by Carl Scheele, who suspected that a new element might lie therein. 

Peter Jacob Hjelm (1746-1813) is given credit for discovering molybdenum in 1781 despite the fact that his paper was not published until 1890. He followed the advice of Carl Wilhelm Scheele (1742-1786), who isolated and identified molybdenum, but incorrecdy thought it was an element related to lead. 

Peter Jacob Hjelm was of about the same age as Scheele, for he was bom on October 2, 1746, at Sunnerbo Harad. He probably met the latter in Upsala, for their correspondence began shortly before Scheele went to Koping (7). At Scheeles suggestion Hjelm tried to reduce molybdic acid with carbon, and in order to get very intimate contact between the two reagents, he stirred the pulverized acid with linseed oil to form a... 

Oct. 2, 1746 Marggraf prepares metallic zinc by reduction of calamine. Birth of Peter Jacob Hjelm, the discoverer of molybdenum, at Sunnerbo Harad, Sweden. 

Molybdenum was one of the first metals to be discovered by a modern chemist. It was found in 1781 by Swedish chemist Peter Jacob Hjelm (1746-1813). Hjelm s work on the element was not published, however, until more than a century later. 

Swedish chemist Peter Jacob Hjelm discovers molybdenum. 

In 1778, Swedish chemist Carl Welhehn Scheele conducted research on a sulfide mineral now known as molybdenite (MoSJ. Molybdenite was often confused with graphite and lead ore. Scheele concluded that it did not contain lead, as was suspected at the time, and reported that the mineral contained a new element that he called molybdenum after the mineral. Molybdenum metal was prepared in an impure form in 1782 by Peter Jacob Hjelm. An... 

He discovers that water is produced. Swedish chemist Peter Jacob Hjelm discovers the element molybdenum. 

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