Properties of Cobalt and Terbium
Melting Point
1,495.00 °C
  
29
1,356.00 °C
  
33
Boiling Point
2,870.00 °C
  
34
3,123.00 °C
  
29
Hardness
  
  
Mohs Hardness
Not Available
  
Vickers Hardness
1,043.00 MPa
  
11
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,720.00 m/s
  
14
2,620.00 m/s
  
35
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Co
  
Tb
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
760.40 kJ/mol
  
19
603.40 kJ/mol
  
99+
2nd Energy Level
1,648.00 kJ/mol
  
31
1,174.80 kJ/mol
  
99+
3rd Energy Level
3,232.00 kJ/mol
  
22
2,417.00 kJ/mol
  
99+
Electrochemical Equivalent
1.10 g/amp-hr
  
99+
1.98 g/amp-hr
  
31
Other Chemical Properties
Density
  
  
Density At Room Temperature
4.51 g/cm3
  
99+
8.23 g/cm3
  
99+
Density When Liquid (at m.p.)
4.11 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Co
  
Tb
  
Group Number
Not Available
  
Period Number
4
  
6
  
Atomic Weight
158.93 amu
  
99+
Atomic Volume
10.64 cm3/mol
  
99+
19.20 cm3/mol
  
22
Electron Configuration
[Ar] 3d2 4s2
  
[Xe] 4f9 6s2
  
Valence Electron Potential
95.20 (-eV)
  
10
46.80 (-eV)
  
33
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Cobalt.jpg#100
  
HCP-Crystal-Structure-of-Terbium.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
420.00 nΩ·m
  
12
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.01 106/cm Ω
  
99+
Electron Affinity
7.60 kJ/mol
  
37
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.52 J/(kg K)
  
9
0.18 J/(kg K)
  
33
Thermal Conductivity
21.90 W/m·K
  
99+
11.10 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.06 J/mol·K
  
99+
28.91 J/mol·K
  
9
Thermal Expansion
8.60 µm/(m·K)
  
99+
10.30 µm/(m·K)
  
38
Standard Molar Entropy
27.30 J/mol.K
  
99+
73.20 J/mol.K
  
10
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol
  
15
330.90 kJ/mol
  
26
Enthalpy of Fusion
15.48 kJ/mol
  
19
10.80 kJ/mol
  
34
Enthalpy of Atomization
468.60 kJ/mol
  
15
314.00 kJ/mol
  
33