Properties of Cobalt and Osmium
Melting Point
1,495.00 °C
  
29
Boiling Point
2,870.00 °C
  
34
Hardness
  
  
Brinell Hardness
3,490.00 MPa
  
1
Vickers Hardness
1,043.00 MPa
  
11
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,720.00 m/s
  
14
4,940.00 m/s
  
11
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Co
  
Os
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
760.40 kJ/mol
  
19
840.00 kJ/mol
  
12
2nd Energy Level
1,648.00 kJ/mol
  
31
1,309.80 kJ/mol
  
99+
3rd Energy Level
3,232.00 kJ/mol
  
22
1,600.00 kJ/mol
  
99+
Electrochemical Equivalent
1.10 g/amp-hr
  
99+
1.77 g/amp-hr
  
38
Other Chemical Properties
Density
  
  
Density At Room Temperature
4.51 g/cm3
  
99+
Density When Liquid (at m.p.)
4.11 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Tensile Strength
1,000.00 MPa
  
4
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Young's Modulus
Not Available
  
Other Mechanical Properties
Symbol
Co
  
Os
  
Period Number
4
  
6
  
Atomic Volume
10.64 cm3/mol
  
99+
8.49 cm3/mol
  
99+
Electron Configuration
[Ar] 3d2 4s2
  
[Xe] 4f14 5d6 6s2
  
Valence Electron Potential
95.20 (-eV)
  
10
91.40 (-eV)
  
12
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Cobalt.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Covalent Radius
Not Available
  
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+
0.11 106/cm Ω
  
18
Electron Affinity
7.60 kJ/mol
  
37
106.10 kJ/mol
  
9
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.52 J/(kg K)
  
9
0.13 J/(kg K)
  
39
Thermal Conductivity
21.90 W/m·K
  
99+
87.60 W/m·K
  
19
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.06 J/mol·K
  
99+
24.70 J/mol·K
  
99+
Thermal Expansion
8.60 µm/(m·K)
  
99+
5.10 µm/(m·K)
  
99+
Standard Molar Entropy
27.30 J/mol.K
  
99+
32.60 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol
  
15
627.60 kJ/mol
  
7
Enthalpy of Fusion
15.48 kJ/mol
  
19
29.30 kJ/mol
  
4
Enthalpy of Atomization
468.60 kJ/mol
  
15
669.00 kJ/mol
  
6