Properties of Iron and Tantalum
Melting Point
1,535.00 °C
  
25
Boiling Point
2,750.00 °C
  
37
Hardness
  
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Speed of Sound
5,120.00 m/s
  
8
3,400.00 m/s
  
22
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Chemical Formula
Fe
  
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
762.50 kJ/mol
  
17
761.00 kJ/mol
  
18
2nd Energy Level
1,561.90 kJ/mol
  
36
1,500.00 kJ/mol
  
40
3rd Energy Level
2,957.00 kJ/mol
  
29
Not Available
  
Electrochemical Equivalent
0.69 g/amp-hr
  
99+
1.35 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.87 g/cm3
  
99+
16.69 g/cm3
  
18
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Tensile Strength
11,000.00 MPa
  
1
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Fe
  
Ta
  
Period Number
4
  
6
  
Atomic Volume
7.10 cm3/mol
  
99+
10.90 cm3/mol
  
99+
Electron Configuration
[Ar] 3d6 4s2
  
[Xe] 4f14 5d3 6s2
  
Valence Electron Potential
67.00 (-eV)
  
20
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
131.00 nΩ·m
  
25
Electrical Conductivity
0.10 106/cm Ω
  
20
0.08 106/cm Ω
  
27
Electron Affinity
15.70 kJ/mol
  
34
31.00 kJ/mol
  
29
Magnetic Characteristics
  
  
Magnetic Ordering
Ferromagnetic
  
Permeability
6.3 * 10
-3 H/m
  
1
Not Available
  
Susceptibility
Not Available
  
Specific Heat
0.44 J/(kg K)
  
13
0.14 J/(kg K)
  
37
Thermal Conductivity
80.40 W/m·K
  
22
57.50 W/m·K
  
27
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.10 J/mol·K
  
99+
25.36 J/mol·K
  
99+
Thermal Expansion
11.80 µm/(m·K)
  
33
6.30 µm/(m·K)
  
99+
Standard Molar Entropy
27.30 J/mol.K
  
99+
41.50 J/mol.K
  
37
Enthalpy
  
  
Enthalpy of Vaporization
351.00 kJ/mol
  
23
753.10 kJ/mol
  
2
Enthalpy of Fusion
14.90 kJ/mol
  
22
31.40 kJ/mol
  
3
Enthalpy of Atomization
414.20 kJ/mol
  
19
782.00 kJ/mol
  
3