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Reference


Molybdenum
Chemical Properties & Compounds



Symbol Atomic Number Atomic Weight Melting Point Boiling Point Phase Density Classification
Mo 42 95.94 2623 °C 4639 °C Solid 10.28 g/cm3 Metal


42 niobium ← molybdenum → technetium
Cr
↑
Mo
↓
W
General
Name, Symbol, Number molybdenum, Mo, 42
Chemical series transition metals
Group, Period, Block 6, 5, d
Appearance gray metallic
Standard atomic weight 95.94(2)  g·mol−1
Electron configuration [Kr] 4d5 5s1
Electrons per shell 2, 8, 18, 13, 1
Physical properties
Phase solid
Density (near r.t.) 10.28  g·cm−3
Liquid density at m.p. 9.33  g·cm−3
Melting point 2896 K
(2623 °C, 4753 °F)
Boiling point 4912 K
(4639 °C, 8382 °F)
Heat of fusion 37.48  kJ·mol−1
Heat of vaporization 617  kJ·mol−1
Heat capacity (25 °C) 24.06  J·mol−1·K−1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 2742 2994 3312 3707 4212 4879
Atomic properties
Crystal structure cubic body centered
Oxidation states 2, 3, 4, 5, 6
(strongly acidic oxide)
Electronegativity 2.16 (scale Pauling)
Ionization energies
(more)		 1st:  684.3  kJ·mol−1
2nd:  1560  kJ·mol−1
3rd:  2618  kJ·mol−1
Atomic radius 145  pm
Atomic radius (calc.) 190  pm
Covalent radius 145  pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity (20 °C) 53.4 n Ω·m
Thermal conductivity (300 K) 138  W·m−1·K−1
Thermal expansion (25 °C) 4.8  µm·m−1·K−1
Speed of sound (thin rod) (r.t.) 5400  m·s−1
Young's modulus 329  GPa
Shear modulus 20  GPa
Bulk modulus 230  GPa
Poisson ratio 0.31
Mohs hardness 5.5
Vickers hardness 1530  MPa
Brinell hardness 1500  MPa
CAS registry number 7439-98-7
Selected isotopes
Main article: Isotopes of molybdenum
iso NA half-life DM DE (MeV) DP
92Mo 14.84% Mo is stable with 50 neutrons
93Mo syn 4×103 y ε - 93Nb
94Mo 9.25% Mo is stable with 52 neutrons
95Mo 15.92% Mo is stable with 53 neutrons
96Mo 16.68% Mo is stable with 54 neutrons
97Mo 9.55% Mo is stable with 55 neutrons
98Mo 24.13% Mo is stable with 56 neutrons
99Mo syn 65.94 h β- 0.436, 1.214 99Tc
γ 0.74, 0.36,
0.14		 -
100Mo 9.63% 7.8×1018 y β-β- 3.04 100Ru
References
Molybdenum Compounds

Source: Wikipedia article Molybdenum


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