Physical Properties Of Molybdenum

Molybdenum is located in the Mendeleev periodic table, period 5 [3], group VIB, for a transition metal elements, molybdenum atomic number 42, atomic weight 95.95, the atomic electron arrangement for: 1s22s22p63s23p64s23d104p64d55s1. Due to the valence electron layer orbital is half-filled state, molybdenum between the lithophilic elements (8-electron ionic configuration) and the copper elements (18-electron ionic configuration), showing a typical transition state. electron-ion configuration), exhibiting a typical transition state. Goldschmidt called it ferrophilic in his geochemical classification of the elements. In nature, molybdenum has seven stable natural isotopes, whose nuclei and their proportions in the natural mixture are listed in the table.

An eighth natural isotope has also been documented to exist. In addition, molybdenum has been found to have eleven man-made radioactive isotopes, which will not be repeated here because of the lack of information and data.
Molybdenum is a silver-white metal, molybdenum atomic radius of 0.14nm, atomic volume of 235.5px/mol, coordination number of 8, crystals for the Az-type body-centered cubic crystal system, the space group of Oh9, so far it has not been found to have an isomerization transition. The lattice parameter of molybdenum at room temperature ranges from 0.31467 to 0.31475 nm and varies with the impurity content. Molybdenum has a very high melting point, ranking sixth among the monomers in nature, and is known as a refractory metal. The density of molybdenum is 10.23g/cm3, about half that of tungsten (tungsten density 19.36g/cm3). Molybdenum has a low coefficient of thermal expansion; molybdenum has a high thermal conductivity. Molybdenum resistivity is low: 5.17×10-10Ω-cm at 0 ℃; 24.6×10-10Ω-cm at 800 ℃; 72×10-10Ω-cm at 2400 ℃. molybdenum is a paramagnet, molybdenum's specific heat at 25 ℃ is 242.8J/(kg-K). Molybdenum's hardness is large, the Mohs hardness is 5~5.5. Molybdenum at the boiling point of the heat of evaporation is 594kJ/mol; the heat of melting is 27.6±2.9kJ/mol; the heat of sublimation at 25℃ is 659kJ/mol.