Properties of Cobalt and Iron
Melting Point
1,495.00 °C
  
29
1,535.00 °C
  
25
Boiling Point
2,870.00 °C
  
34
2,750.00 °C
  
37
Hardness
  
  
Vickers Hardness
1,043.00 MPa
  
11
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Speed of Sound
4,720.00 m/s
  
14
5,120.00 m/s
  
8
Allotropes
Yes
  
Yes
  
γ Allotropes
Not Available
  
Chemical Formula
Co
  
Fe
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
760.40 kJ/mol
  
19
762.50 kJ/mol
  
17
2nd Energy Level
1,648.00 kJ/mol
  
31
1,561.90 kJ/mol
  
36
3rd Energy Level
3,232.00 kJ/mol
  
22
2,957.00 kJ/mol
  
29
Electrochemical Equivalent
1.10 g/amp-hr
  
99+
0.69 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
4.51 g/cm3
  
99+
7.87 g/cm3
  
99+
Density When Liquid (at m.p.)
4.11 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Tensile Strength
11,000.00 MPa
  
1
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Co
  
Fe
  
Period Number
4
  
4
  
Atomic Volume
10.64 cm3/mol
  
99+
7.10 cm3/mol
  
99+
Electron Configuration
[Ar] 3d2 4s2
  
[Ar] 3d6 4s2
  
Valence Electron Potential
95.20 (-eV)
  
10
67.00 (-eV)
  
20
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Cobalt.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
420.00 nΩ·m
  
12
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.10 106/cm Ω
  
20
Electron Affinity
7.60 kJ/mol
  
37
15.70 kJ/mol
  
34
Magnetic Characteristics
  
  
Magnetic Ordering
Ferromagnetic
  
Permeability
Not Available
  
6.3 * 10
-3 H/m
  
1
Susceptibility
Not Available
  
Specific Heat
0.52 J/(kg K)
  
9
0.44 J/(kg K)
  
13
Thermal Conductivity
21.90 W/m·K
  
99+
80.40 W/m·K
  
22
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.06 J/mol·K
  
99+
25.10 J/mol·K
  
99+
Thermal Expansion
8.60 µm/(m·K)
  
99+
11.80 µm/(m·K)
  
33
Standard Molar Entropy
27.30 J/mol.K
  
99+
27.30 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol
  
15
351.00 kJ/mol
  
23
Enthalpy of Fusion
15.48 kJ/mol
  
19
14.90 kJ/mol
  
22
Enthalpy of Atomization
468.60 kJ/mol
  
15
414.20 kJ/mol
  
19