Properties of Molybdenum and Beryllium
Melting Point
1,278.00 °C
  
36
Boiling Point
2,970.00 °C
  
32
Hardness
  
  
Brinell Hardness
1,370.00 MPa
  
7
Vickers Hardness
1,400.00 MPa
  
6
1,670.00 MPa
  
4
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
5,400.00 m/s
  
6
12,890.00 m/s
  
2
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Mo
  
Be
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
684.30 kJ/mol
  
37
899.50 kJ/mol
  
7
2nd Energy Level
1,560.00 kJ/mol
  
37
1,757.10 kJ/mol
  
23
3rd Energy Level
2,618.00 kJ/mol
  
99+
14,848.70 kJ/mol
  
2
Electrochemical Equivalent
0.89 g/amp-hr
  
99+
0.17 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
10.28 g/cm3
  
36
1.85 g/cm3
  
99+
Density When Liquid (at m.p.)
1.69 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Mo
  
Be
  
Period Number
5
  
2
  
Atomic Volume
9.40 cm3/mol
  
99+
5.00 cm3/mol
  
99+
Electron Configuration
[Kr] 4d5 5s1
  
[He] 2s2
  
Valence Electron Potential
88.60 (-eV)
  
13
82.00 (-eV)
  
15
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
HCP-Crystal-Structure-of-Beryllium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
53.40 nΩ·m
  
99+
36.00 nΩ·m
  
99+
Electrical Conductivity
0.19 106/cm Ω
  
11
0.31 106/cm Ω
  
5
Electron Affinity
71.90 kJ/mol
  
14
0.00 kJ/mol
  
40
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.25 J/(kg K)
  
21
1.82 J/(kg K)
  
2
Thermal Conductivity
138.00 W/m·K
  
12
200.00 W/m·K
  
6
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.06 J/mol·K
  
99+
16.44 J/mol·K
  
99+
Thermal Expansion
4.80 µm/(m·K)
  
99+
11.30 µm/(m·K)
  
34
Standard Molar Entropy
28.70 J/mol.K
  
99+
9.50 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
594.10 kJ/mol
  
8
294.70 kJ/mol
  
30
Enthalpy of Fusion
27.61 kJ/mol
  
5
11.72 kJ/mol
  
30
Enthalpy of Atomization
653.00 kJ/mol
  
7
326.40 kJ/mol
  
30