Properties of Rhenium and Samarium
Melting Point
1,072.00 °C
  
99+
Boiling Point
1,900.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
1,320.00 MPa
  
8
Vickers Hardness
1,350.00 MPa
  
7
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
4,700.00 m/s
  
15
2,130.00 m/s
  
99+
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Re
  
Sm
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
760.00 kJ/mol
  
20
544.50 kJ/mol
  
99+
2nd Energy Level
1,260.00 kJ/mol
  
99+
1,070.00 kJ/mol
  
99+
3rd Energy Level
2,510.00 kJ/mol
  
99+
2,260.00 kJ/mol
  
99+
Electrochemical Equivalent
0.99 g/amp-hr
  
99+
1.87 g/amp-hr
  
34
Other Chemical Properties
Density
  
  
Density At Room Temperature
21.02 g/cm3
  
12
7.52 g/cm3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
1,070.00 MPa
  
3
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Re
  
Sm
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
150.36 amu
  
99+
Atomic Volume
8.85 cm3/mol
  
99+
19.95 cm3/mol
  
19
Electron Configuration
[Xe] 4f14 5d5 6s2
  
[Xe] 4f6 6s2
  
Valence Electron Potential
180.00 (-eV)
  
3
44.80 (-eV)
  
37
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
RHO-Crystal-Structure-of-Samarium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
193.00 nΩ·m
  
20
Electrical Conductivity
0.05 106/cm Ω
  
33
0.01 106/cm Ω
  
99+
Electron Affinity
14.50 kJ/mol
  
35
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.20 J/(kg K)
  
31
Thermal Conductivity
48.00 W/m·K
  
31
13.30 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.48 J/mol·K
  
38
29.54 J/mol·K
  
7
Thermal Expansion
6.20 µm/(m·K)
  
99+
12.70 µm/(m·K)
  
30
Standard Molar Entropy
36.90 J/mol.K
  
99+
69.60 J/mol.K
  
15
Enthalpy
  
  
Enthalpy of Vaporization
707.10 kJ/mol
  
3
166.40 kJ/mol
  
99+
Enthalpy of Fusion
33.05 kJ/mol
  
2
8.62 kJ/mol
  
40
Enthalpy of Atomization
791.00 kJ/mol
  
2
209.00 kJ/mol
  
99+