Element Number: 42 Element symbol: Mo Element Name: Molybdenum element Atomic weight: 95.94 Element Type:
Metal discoverer: Elm
Discovery date: 1782 Discovery process: 1782, Elm, Sweden, with linseed oil mixed charcoal and molybdic acid closed burning, and obtained molybdenum.
Element Description: Silver-white metal, hard and tough. Density 10.2 g\/cm 3. Melting point 2610℃. Boiling point 5560℃. Valence 2, 4 and 6, stable valence 6. The first ionization energy is 7.099 electron volts. It is not corroded by air at normal temperature. It doesn't react with hydrochloric or hydrofluoric acid. Element source: The main mineral is molybdenite (MoS2). Molybdenum trioxide is calcined from molybdenite and then reduced by hydrogen or thermit. Element use: pure molybdenum wire for high temperature electric furnace; Molybdenum sheets are used to make wireless appliances and X-ray equipment; Adding molybdenum to alloy steel can improve the elastic limit, corrosion resistance and maintain permanent magnetic properties. Molybdenum is one of the seven micronutrients needed for plant growth and development, without which plants cannot survive. Animals and fish need molybdenum as well as plants.