Properties of Hafnium and Silver
Melting Point
2,150.00 °C
  
10
Boiling Point
2,212.00 °C
  
99+
Hardness
  
  
Brinell Hardness
1,450.00 MPa
  
6
Vickers Hardness
1,520.00 MPa
  
5
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
3,010.00 m/s
  
27
2,680.00 m/s
  
34
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Hf
  
Ag
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol
  
40
731.00 kJ/mol
  
27
2nd Energy Level
1,440.00 kJ/mol
  
99+
2,070.00 kJ/mol
  
11
3rd Energy Level
2,250.00 kJ/mol
  
99+
3,361.00 kJ/mol
  
19
Electrochemical Equivalent
1.66 g/amp-hr
  
99+
4.02 g/amp-hr
  
7
Other Chemical Properties
Density
  
  
Density At Room Temperature
13.31 g/cm3
  
26
10.49 g/cm3
  
35
Density When Liquid (at m.p.)
12.00 g/cm3
  
12
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
Hf
  
Ag
  
Period Number
6
  
5
  
Atomic Weight
107.87 amu
  
99+
Atomic Volume
13.60 cm3/mol
  
38
10.30 cm3/mol
  
99+
Electron Configuration
[Xe] 4f14 5d2 6s2
  
[Kr] 4d10 5s1
  
Valence Electron Potential
81.00 (-eV)
  
16
11.40 (-eV)
  
99+
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.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
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
331.00 nΩ·m
  
14
15.87 nΩ·m
  
99+
Electrical Conductivity
0.03 106/cm Ω
  
39
0.63 106/cm Ω
  
1
Electron Affinity
0.00 kJ/mol
  
40
125.60 kJ/mol
  
5
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Specific Heat
0.14 J/(kg K)
  
37
0.24 J/(kg K)
  
25
Thermal Conductivity
23.00 W/m·K
  
99+
429.00 W/m·K
  
1
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.73 J/mol·K
  
36
25.35 J/mol·K
  
99+
Thermal Expansion
5.90 µm/(m·K)
  
99+
18.90 µm/(m·K)
  
23
Standard Molar Entropy
43.60 J/mol.K
  
34
42.60 J/mol.K
  
35
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol
  
5
255.10 kJ/mol
  
37
Enthalpy of Fusion
25.10 kJ/mol
  
8
11.30 kJ/mol
  
31
Enthalpy of Atomization
703.00 kJ/mol
  
5
284.50 kJ/mol
  
37