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Technical data for Molybdenum

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Overview
NameMolybdenum
SymbolMo
Atomic Number42
Atomic Weight95.94
Density10.28 g/cm3
Melting Point2623 °C
Boiling Point4639 °C

Thermal properties
PhaseSolid
Melting Point2623 °C
Boiling Point4639 °C
Absolute Melting Point2896 K
Absolute Boiling Point4912 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion36 kJ/mol
Heat of Vaporization600 kJ/mol
Heat of CombustionN/A
Specific Heat251 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity139 W/(m K)
Thermal Expansion4.8×10-6 K-1

Bulk physical properties
Density10.28 g/cm3
Density (Liquid)9.33 g/cm3
Molar Volume9.333×10-6
Brinell Hardness1.5×103 MPa
Mohs Hardness5.5 MPa
Vickers Hardness1530 MPa
Bulk Modulus230 GPa
Shear Modulus20 GPa
Young Modulus329 GPa
Poisson Ratio0.31
Refractive IndexN/A
Speed of Sound6190 m/s
Thermal Conductivity139 W/(m K)
Thermal Expansion4.8×10-6 K-1

Reactivity
Valence6
Electronegativity2.16
ElectronAffinity71.9 kJ/mol
Ionization Energies
684.3, 1560, 2618, 4480, 5257, 6640.8, 12125, 13860, 15835, 17980, 20190, 22219, 26930, 29196, 52490, 5.5×104, 6.14×104, 6.77×104, 7.4×104, 8.04×104, 8.7×104 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire Rating3
NFPA HazardsN/A
NFPA Health Rating1
NFPA Reactivity Rating0
RTECS NumberRTECSQA4680000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group6
Period5
Electron Configuration[Kr]4d55s1
ColorGray
Discovery
1781 in Sweden
Gas phaseN/A
CAS NumberCAS7439-98-7
CID NumberCID23932
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSQA4680000

Electrical properties
Electrical TypeConductor
Electrical Conductivity2×107 S/m
Resistivity5×10-8 m Ω
Superconducting Point0.915

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.17×10-8
Molar Magnetic Susceptibility1.122×10-9
Volume Magnetic Susceptibility0.0001203

Abundances
% in Universe5×10-7%
% in Sun9×10-7%
% in Meteorites0.00012%
% in Earth's Crust0.00011%
% in Oceans1×10-6%
% in Humans0.00001%

Atomic dimensions and structure
Atomic Radius190 pm
Covalent Radius145 pm
Van der Waals RadiusN/A
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
314.7, 314.7, 314.7 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers7S3
Neutron Cross Section2.6
Neutron Mass Absorption0.0009
Known Isotopes
83Mo, 84Mo, 85Mo, 86Mo, 87Mo, 88Mo, 89Mo, 90Mo, 91Mo, 92Mo, 93Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo, 99Mo, 100Mo, 101Mo, 102Mo, 103Mo, 104Mo, 105Mo, 106Mo, 107Mo, 108Mo, 109Mo, 110Mo, 111Mo, 112Mo, 113Mo, 114Mo, 115Mo
Stable Isotopes
92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo
Isotopic Abundances
100Mo9.63%
92Mo14.84%
94Mo9.25%
95Mo15.92%
96Mo16.68%
97Mo9.55%
98Mo24.13%


Notes on the properties of Molybdenum:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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