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(Molybdenum) [1], chemical symbol Mo, atomic number 42, is a transition metal element, an essential trace element for the human body, animals and plants, molybdenum is a silver-white metal, hard and tough . Various tissues of the human body contain molybdenum. The total amount in the human body is about 9 mg, with the highest content in the liver and kidneys.

In 1782, Elm in Sweden obtained molybdenum by burning a mixture of charcoal and molybdic acid mixed with linseed oil in a sealed manner.