Properties of Beryllium and Magnesium
Melting Point
1,278.00 °C
  
36
Boiling Point
2,970.00 °C
  
32
1,107.00 °C
  
99+
Hardness
  
  
Vickers Hardness
1,670.00 MPa
  
4
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
12,890.00 m/s
  
2
4,940.00 m/s
  
11
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Be
  
Mg
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
899.50 kJ/mol
  
7
737.70 kJ/mol
  
24
2nd Energy Level
1,757.10 kJ/mol
  
23
1,450.70 kJ/mol
  
99+
3rd Energy Level
14,848.70 kJ/mol
  
2
7,732.70 kJ/mol
  
5
Electrochemical Equivalent
0.17 g/amp-hr
  
99+
0.45 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
1.85 g/cm3
  
99+
1.74 g/cm3
  
99+
Density When Liquid (at m.p.)
1.69 g/cm3
  
99+
1.58 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
NA
  
Symbol
Be
  
Mg
  
Period Number
2
  
3
  
Atomic Volume
5.00 cm3/mol
  
99+
13.97 cm3/mol
  
37
Electron Configuration
[He] 2s2
  
[Ne] 3s2
  
Valence Electron Potential
82.00 (-eV)
  
15
40.00 (-eV)
  
99+
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Beryllium.jpg#100
  
HCP-Crystal-Structure-of-Magnesium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
36.00 nΩ·m
  
99+
43.90 nΩ·m
  
99+
Electrical Conductivity
0.31 106/cm Ω
  
5
0.23 106/cm Ω
  
7
Electron Affinity
0.00 kJ/mol
  
40
0.00 kJ/mol
  
40
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
1.82 J/(kg K)
  
2
1.02 J/(kg K)
  
4
Thermal Conductivity
200.00 W/m·K
  
6
156.00 W/m·K
  
8
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
16.44 J/mol·K
  
99+
24.87 J/mol·K
  
99+
Thermal Expansion
11.30 µm/(m·K)
  
34
24.80 µm/(m·K)
  
15
Standard Molar Entropy
9.50 J/mol.K
  
99+
32.70 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
294.70 kJ/mol
  
30
128.70 kJ/mol
  
99+
Enthalpy of Fusion
11.72 kJ/mol
  
30
8.95 kJ/mol
  
39
Enthalpy of Atomization
326.40 kJ/mol
  
30
148.50 kJ/mol
  
99+