Properties of Cobalt and Silver
Melting Point
1,495.00 °C
  
29
Boiling Point
2,870.00 °C
  
34
2,212.00 °C
  
99+
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
2,680.00 m/s
  
34
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Co
  
Ag
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
760.40 kJ/mol
  
19
731.00 kJ/mol
  
27
2nd Energy Level
1,648.00 kJ/mol
  
31
2,070.00 kJ/mol
  
11
3rd Energy Level
3,232.00 kJ/mol
  
22
3,361.00 kJ/mol
  
19
Electrochemical Equivalent
1.10 g/amp-hr
  
99+
4.02 g/amp-hr
  
7
Other Chemical Properties
Density
  
  
Density At Room Temperature
4.51 g/cm3
  
99+
10.49 g/cm3
  
35
Density When Liquid (at m.p.)
4.11 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Co
  
Ag
  
Period Number
4
  
5
  
Atomic Weight
107.87 amu
  
99+
Atomic Volume
10.64 cm3/mol
  
99+
10.30 cm3/mol
  
99+
Electron Configuration
[Ar] 3d2 4s2
  
[Kr] 4d10 5s1
  
Valence Electron Potential
95.20 (-eV)
  
10
11.40 (-eV)
  
99+
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Cobalt.jpg#100
  
FCC-Crystal-Structure-of-Silver.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
15.87 nΩ·m
  
99+
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.63 106/cm Ω
  
1
Electron Affinity
7.60 kJ/mol
  
37
125.60 kJ/mol
  
5
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Specific Heat
0.52 J/(kg K)
  
9
0.24 J/(kg K)
  
25
Thermal Conductivity
21.90 W/m·K
  
99+
429.00 W/m·K
  
1
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.06 J/mol·K
  
99+
25.35 J/mol·K
  
99+
Thermal Expansion
8.60 µm/(m·K)
  
99+
18.90 µm/(m·K)
  
23
Standard Molar Entropy
27.30 J/mol.K
  
99+
42.60 J/mol.K
  
35
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol
  
15
255.10 kJ/mol
  
37
Enthalpy of Fusion
15.48 kJ/mol
  
19
11.30 kJ/mol
  
31
Enthalpy of Atomization
468.60 kJ/mol
  
15
284.50 kJ/mol
  
37