Properties of Copper and Terbium
Melting Point
1,084.62 °C
  
40
1,356.00 °C
  
33
Boiling Point
2,562.00 °C
  
99+
3,123.00 °C
  
29
Hardness
  
  
Mohs Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
3,810.00 m/s
  
19
2,620.00 m/s
  
35
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Cu
  
Tb
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
745.50 kJ/mol
  
22
603.40 kJ/mol
  
99+
2nd Energy Level
1,957.90 kJ/mol
  
15
1,174.80 kJ/mol
  
99+
3rd Energy Level
3,555.00 kJ/mol
  
15
2,417.00 kJ/mol
  
99+
Electrochemical Equivalent
1.19 g/amp-hr
  
99+
1.98 g/amp-hr
  
31
Other Chemical Properties
Density
  
  
Density At Room Temperature
8.96 g/cm3
  
99+
8.23 g/cm3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Cu
  
Tb
  
Group Number
Not Available
  
Period Number
4
  
6
  
Atomic Weight
158.93 amu
  
99+
Atomic Volume
7.10 cm3/mol
  
99+
19.20 cm3/mol
  
22
Electron Configuration
[Ar] 3d10 4s1
  
[Xe] 4f9 6s2
  
Valence Electron Potential
34.00 (-eV)
  
99+
46.80 (-eV)
  
33
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Copper.jpg#100
  
HCP-Crystal-Structure-of-Terbium.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
16.78 nΩ·m
  
99+
Electrical Conductivity
0.60 106/cm Ω
  
2
0.01 106/cm Ω
  
99+
Electron Affinity
222.80 kJ/mol
  
1
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
1.256629 * 10
-6 H/m
  
5
Not Available
  
Susceptibility
-9.63 * 10
-6
  
4
Not Available
  
Specific Heat
0.38 J/(kg K)
  
15
0.18 J/(kg K)
  
33
Thermal Conductivity
401.00 W/m·K
  
2
11.10 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.44 J/mol·K
  
99+
28.91 J/mol·K
  
9
Thermal Expansion
16.50 µm/(m·K)
  
25
10.30 µm/(m·K)
  
38
Standard Molar Entropy
33.20 J/mol.K
  
99+
73.20 J/mol.K
  
10
Enthalpy
  
  
Enthalpy of Vaporization
283.70 kJ/mol
  
33
330.90 kJ/mol
  
26
Enthalpy of Fusion
7.11 kJ/mol
  
99+
10.80 kJ/mol
  
34
Enthalpy of Atomization
338.90 kJ/mol
  
29
314.00 kJ/mol
  
33