Properties of Hafnium and Radium
Melting Point
2,150.00 °C
  
10
Boiling Point
1,737.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
1,450.00 MPa
  
6
Not Available
  
Vickers Hardness
1,520.00 MPa
  
5
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
3,010.00 m/s
  
27
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Hf
  
Ra
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol
  
40
509.30 kJ/mol
  
99+
2nd Energy Level
1,440.00 kJ/mol
  
99+
979.00 kJ/mol
  
99+
3rd Energy Level
2,250.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
1.66 g/amp-hr
  
99+
4.22 g/amp-hr
  
6
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
13.31 g/cm3
  
26
5.50 g/cm3
  
99+
Density When Liquid (at m.p.)
12.00 g/cm3
  
12
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Hf
  
Ra
  
Period Number
6
  
7
  
Atomic Volume
13.60 cm3/mol
  
38
45.20 cm3/mol
  
4
Electron Configuration
[Xe] 4f14 5d2 6s2
  
[Rn] 7s2
  
Valence Electron Potential
81.00 (-eV)
  
16
20.10 (-eV)
  
99+
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Atomic Radius
Not Available
  
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
100.00 nΩ·m
  
31
Electrical Conductivity
0.03 10
6/cm Ω
  
39
Not Available
  
Electron Affinity
0.00 kJ/mol
  
40
Not Available
  
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.14 J/(kg K)
  
37
0.12 J/(kg K)
  
40
Thermal Conductivity
23.00 W/m·K
  
99+
18.60 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.73 J/mol·K
  
36
Not Available
  
Thermal Expansion
5.90 µm/(m·K)
  
99+
Not Available
  
Standard Molar Entropy
43.60 J/mol.K
  
34
71.00 J/mol.K
  
14
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol
  
5
Not Available
  
Enthalpy of Fusion
25.10 kJ/mol
  
8
Not Available
  
Enthalpy of Atomization
703.00 kJ/mol
  
5
163.00 kJ/mol
  
99+