Properties of Vanadium and Tantalum
Melting Point
1,890.00 °C
  
13
Boiling Point
3,380.00 °C
  
20
Hardness
  
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Speed of Sound
4,560.00 m/s
  
17
3,400.00 m/s
  
22
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
V
  
Ta
  
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
650.90 kJ/mol
  
99+
761.00 kJ/mol
  
18
2nd Energy Level
1,414.00 kJ/mol
  
99+
1,500.00 kJ/mol
  
40
3rd Energy Level
2,830.00 kJ/mol
  
35
Not Available
  
Electrochemical Equivalent
0.38 g/amp-hr
  
99+
1.35 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
6.00 g/cm3
  
99+
16.69 g/cm3
  
18
Density When Liquid (at m.p.)
5.50 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
V
  
Ta
  
Period Number
4
  
6
  
Atomic Volume
8.78 cm3/mol
  
99+
10.90 cm3/mol
  
99+
Electron Configuration
[Ar] 3d3 4s2
  
[Xe] 4f14 5d3 6s2
  
Valence Electron Potential
120.00 (-eV)
  
6
110.00 (-eV)
  
7
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
197.00 nΩ·m
  
19
131.00 nΩ·m
  
25
Electrical Conductivity
0.05 106/cm Ω
  
35
0.08 106/cm Ω
  
27
Electron Affinity
50.60 kJ/mol
  
20
31.00 kJ/mol
  
29
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.49 J/(kg K)
  
10
0.14 J/(kg K)
  
37
Thermal Conductivity
30.70 W/m·K
  
39
57.50 W/m·K
  
27
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.89 J/mol·K
  
99+
25.36 J/mol·K
  
99+
Thermal Expansion
8.40 µm/(m·K)
  
99+
6.30 µm/(m·K)
  
99+
Standard Molar Entropy
28.90 J/mol.K
  
99+
41.50 J/mol.K
  
37
Enthalpy
  
  
Enthalpy of Vaporization
458.60 kJ/mol
  
14
753.10 kJ/mol
  
2
Enthalpy of Fusion
17.57 kJ/mol
  
14
31.40 kJ/mol
  
3
Enthalpy of Atomization
514.60 kJ/mol
  
13
782.00 kJ/mol
  
3