Molybdenum

Overview

English Name:

Molybdenum

Latin Name:

Molybdaenum

Year Discovered:

1778

Discovered By:

Carl Wilhelm Scheele

Group:

6

Period:

5

Electrons:

42

CAS Number:

7439-98-7

Cost Per 100 Grams:

$25

Atomic Properties

Electronic Configuration:

[Kr] 5s² 4d⁵

Ion Charge:

+6

Ionisation Energies:

684.3 kJ/mol

Atomic Radius (Empirical):

139 pm

Atomic Radius (Calculated):

210 pm

Covalent Radius:

150 pm

Van Der Waals Radius:

N/A

Ionisation Potential of An Atom:

7.092 eV

Electrons Per Layer:

2, 8, 18, 13, 1

Atomic Multiplicities Of The Gas:

1

Atomic Weight:

95.94

Reactivity

Electron Affinity:

−70 kJ/mol

Valence:

6

Electronegativity:

2.16

Thermal Properties

Melting Point:

2623°C

Boiling Point:

4639°C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

138 W/(m·K)

Heat Capacity:

Specific: 0.25 J/(g·K)

Molar: 25.1 J/(mol·K)

Thermal Coefficient:

0.000005

Enthalpy:

Fusion: 10.2 kJ/mol

Vaporisation: 300 kJ/mol

Atomization: 200 kJ/mol

Curie Temperature:

N/A

Neel Temperature:

N/A

Superconductivity Point:

N/A

Physical and Chemical Properties

State of matter (25° C/ 77°F):

Solid

Density:

Solid: 10.28 g/cm³

Molar Volume (Vmol):

9.34 L/mol

Speed of Sound (Vs):

6000 m/s

Hardness:

N/A

Bulk Modulus (K):

170 GPa

Shear Modulus (G):

N/A

Young's Modulus (E):

N/A

Color:

Silvery-grey

Brinell Hardness (MPa):

N/A

Liquid Density (Kg/m^3):

N/A

Hardness of Mohs:

N/A

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

Body-centered cubic

Electromagnetic Properties

Electrical Type:

Conductor

Resistivity:

5.0 × 10^-7 Ω·m

Magnetic Type:

Paramagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

+1.0 × 10^-5

Mass Magnetic Susceptibility:

+1.2 × 10^-5 m³/kg

Molar Mass Susceptibility:

+2.0 × 10^-4 m³/mol

Electrical Conductivity:

10^6 S/m

Mass (γ_mass):

1.0 × 10^-25 kg

Mass (γ_mol):

1.0 × 10^-22 mol

Volume (γ_vol):

9.34 L

Grid Parameters

Crystal Structure:

Body-centered cubic

Grid Parameters:

N/A

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Warning

Hazard Statements:

H228

Precautionary Statements:

P220, P244, P370 + P376

RTECS Number:

Not available

Risk:

Flammability: Flammable
Health Risk: Irritant
Reactivity: Stable
Specific Risk: None

Importance

Main sources:

Columbite, molybdenite

Main Usage:

Steel production, catalysts

Nuclear Properties

Radioactive:

No

Isotopes:

Mo-92, Mo-94

Neutron Cross Sectional:

0.1 barns

Half Life (s):

None

Lifetime:

Stable

Prevalence

Universe:

0.0003%

Sun:

0.0003%

Oceans:

0.00001%

Humans:

0.00001%

Earth's Crust:

0.001%

Meteorites:

0.001%