Discovered By: Peter Jacob Hjelm
Discovery year: 1781

The following table showing some properties of Molybdenum(Mo):

Table Example
Atomic number 42
Group 6
Period 5
Block d
Electrons 42
Protons 42
Neutrons 54
Atomic weight 95.95
Oxidation states -2, +2, +3, +4, +5, +6
Ionic charge Mo^6+


Table Example
Electrons per shell K2 L8 M18 N13 O1
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1 4d^5
Atomic radius 190 pm
Covalent radius 154 pm
Boiling point 4639°C
Melting point 2623°C
Phase Solid
Fusion heat 36 kJ.mol^-1
Vaporization heat 600 kJ.mol^-1
Thermal expansion 4.8*10^-6 K^-1


Table Example
Color Gray
Brinell hardness 4500 MPa
Bulk modulus 230 GPa
Density 10280 kg.m^-3
Liquid density 9330 kg.m^-3
Mohs hardness 5.5
Molar volume 9.33*10^-6 m^3.mol^-1
Poisson ratio 0.31
Shear modulus 20 GPa
Sound speed 6190 m.s^-1


Table Example
Vickers hardness 1530 MPa
Young's modulus GPa
Electrical conductivity 2.10^7 S.m^-1
Electrical type Conductor
Magnetic type Paramagnetic
Volume magnetic susceptibility 1.203*10^-4
Resistivity 5*10^-8 ohm.m
Superconducting point 0.915 K
Electronegativity 2.16
Valence 6
Radioactive No
Neutron cross section 2.6 barn