Properties of Barium and Tantalum
Boiling Point
1,140.00 °C
  
99+
Hardness
  
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
1,620.00 m/s
  
99+
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
Ba
  
Ta
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
502.90 kJ/mol
  
99+
761.00 kJ/mol
  
18
2nd Energy Level
965.20 kJ/mol
  
99+
1,500.00 kJ/mol
  
40
3rd Energy Level
3,600.00 kJ/mol
  
14
Not Available
  
Electrochemical Equivalent
2.56 g/amp-hr
  
20
1.35 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
3.51 g/cm3
  
99+
16.69 g/cm3
  
18
Density When Liquid (at m.p.)
3.34 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Ba
  
Ta
  
Period Number
6
  
6
  
Atomic Weight
137.33 amu
  
99+
Atomic Volume
39.24 cm3/mol
  
5
10.90 cm3/mol
  
99+
Electron Configuration
[Xe] 6s2
  
[Xe] 4f14 5d3 6s2
  
Valence Electron Potential
21.30 (-eV)
  
99+
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
332.00 nΩ·m
  
13
131.00 nΩ·m
  
25
Electrical Conductivity
0.03 106/cm Ω
  
40
0.08 106/cm Ω
  
27
Electron Affinity
13.95 kJ/mol
  
36
31.00 kJ/mol
  
29
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.20 J/(kg K)
  
30
0.14 J/(kg K)
  
37
Thermal Conductivity
18.40 W/m·K
  
99+
57.50 W/m·K
  
27
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
28.07 J/mol·K
  
12
25.36 J/mol·K
  
99+
Thermal Expansion
20.60 µm/(m·K)
  
22
6.30 µm/(m·K)
  
99+
Standard Molar Entropy
62.50 J/mol.K
  
20
41.50 J/mol.K
  
37
Enthalpy
  
  
Enthalpy of Vaporization
140.00 kJ/mol
  
99+
753.10 kJ/mol
  
2
Enthalpy of Fusion
7.66 kJ/mol
  
99+
31.40 kJ/mol
  
3
Enthalpy of Atomization
175.70 kJ/mol
  
99+
782.00 kJ/mol
  
3