Properties of Samarium and Samarium
Melting Point
1,072.00 °C
  
99+
1,072.00 °C
  
99+
Boiling Point
1,900.00 °C
  
99+
1,900.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
2,130.00 m/s
  
99+
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
Sm
  
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
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol
  
99+
544.50 kJ/mol
  
99+
2nd Energy Level
1,070.00 kJ/mol
  
99+
1,070.00 kJ/mol
  
99+
3rd Energy Level
2,260.00 kJ/mol
  
99+
2,260.00 kJ/mol
  
99+
Electrochemical Equivalent
1.87 g/amp-hr
  
34
1.87 g/amp-hr
  
34
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.52 g/cm
3
  
99+
7.52 g/cm
3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
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
Sm
  
Sm
  
Group Number
Not Available
  
Not Available
  
Period Number
6
  
6
  
Atomic Weight
150.36 amu
  
99+
150.36 amu
  
99+
Atomic Volume
19.95 cm3/mol
  
19
19.95 cm3/mol
  
19
Electron Configuration
[Xe] 4f6 6s2
  
[Xe] 4f6 6s2
  
Valence Electron Potential
44.80 (-eV)
  
37
44.80 (-eV)
  
37
Atom
  
  
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.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
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.01 10
6/cm Ω
  
99+
0.01 10
6/cm Ω
  
99+
Electron Affinity
50.00 kJ/mol
  
21
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.20 J/(kg K)
  
31
0.20 J/(kg K)
  
31
Thermal Conductivity
13.30 W/m·K
  
99+
13.30 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
29.54 J/mol·K
  
7
29.54 J/mol·K
  
7
Thermal Expansion
12.70 µm/(m·K)
  
30
12.70 µm/(m·K)
  
30
Standard Molar Entropy
69.60 J/mol.K
  
15
69.60 J/mol.K
  
15
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol
  
99+
166.40 kJ/mol
  
99+
Enthalpy of Fusion
8.62 kJ/mol
  
40
8.62 kJ/mol
  
40
Enthalpy of Atomization
209.00 kJ/mol
  
99+
209.00 kJ/mol
  
99+