Peter Jacob Hjelm
Swedish chemist · Sweden · On the map · Scientists · Lived 1746 to 1813 · aged 67
Peter (Petter) Jacob Hjelm was a Swedish chemist and the first person to isolate the element molybdenum in 1781, four years after its discovery by Swedish chemist Carl Wilhelm Scheele.
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Working with Molybdic acid, Hjelm chemically reduced molybdenum oxide with carbon in an oxygen-free atmosphere, resulting in carbon dioxide and a near-pure dark metal powder to which he gave the name 'molybdenum'. His first publication on molybdenum appeared in 1790.
