When was molybdenum discovered and who discovered it?
Swedish chemist Carl Wilhelm Scheele definitively proved molybdenum was a distinct new element in 1778. Peter Jacob Hjelm successfully extracted the metal in 1781 using carbon and linseed oil.
Common questions about Molybdenum
Short answers, pulled from the story.
How did molybdenum affect World War I tank and artillery development?
Molybdenum substituted for tungsten in steel alloys to create lighter, more maneuverable tanks with superior protection. German forces utilized molybdenum-doped steel for the Big Bertha howitzer which fired one-ton shells capable of melting traditional steel.
What is the role of molybdenum in biological nitrogen fixation?
Molybdenum-containing enzymes like nitrogenase catalyze the production of ammonia from atmospheric nitrogen in bacteria and cyanobacteria. This process known as biological nitrogen fixation is essential for biosynthesis and the survival of all higher eukaryote organisms including humans.
How many electrons are in the sextuple bond of the Mo2 molecule?
The Mo2 molecule contains two unpaired electrons in bonding orbitals in addition to five conventional bonds resulting in a sextuple bond. This singlet state defies conventional chemical understanding and highlights the unique electronic structure of molybdenum.
What is the daily molybdenum intake limit for humans before toxicity occurs?
Chronic ingestion of more than 10 milligrams per day of molybdenum can cause diarrhea, growth retardation, infertility, low birth weight, and gout. The human body contains about 0.07 milligrams per kilogram of body weight and severe deficiency leads to poorly functioning sulfite oxidase.
Which countries produce the most molybdenum and what was the peak price in 2005?
China, the United States, Chile, Peru, and Mexico led global production which reached 250,000 tonnes in 2011. Molybdenum value reached a peak of 103,000 dollars per tonne in June 2005 before the London Metal Exchange announced it would be traded as a commodity.