Properties of Zirconium and Tantalum
Melting Point
1,852.00 °C
  
15
Boiling Point
4,377.00 °C
  
11
Hardness
  
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
3,800.00 m/s
  
20
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
Zr
  
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
640.10 kJ/mol
  
99+
761.00 kJ/mol
  
18
2nd Energy Level
1,270.00 kJ/mol
  
99+
1,500.00 kJ/mol
  
40
3rd Energy Level
2,218.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
0.85 g/amp-hr
  
99+
1.35 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
6.52 g/cm3
  
99+
16.69 g/cm3
  
18
Density When Liquid (at m.p.)
5.80 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
Zr
  
Ta
  
Period Number
5
  
6
  
Atomic Volume
14.10 cm3/mol
  
36
10.90 cm3/mol
  
99+
Electron Configuration
[Kr] 4d2 5s2
  
[Xe] 4f14 5d3 6s2
  
Valence Electron Potential
80.00 (-eV)
  
18
110.00 (-eV)
  
7
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Zirconium.jpg#100
  
BCC-Crystal-Structure-.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
421.00 nΩ·m
  
11
131.00 nΩ·m
  
25
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.08 106/cm Ω
  
27
Electron Affinity
41.10 kJ/mol
  
27
31.00 kJ/mol
  
29
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.27 J/(kg K)
  
19
0.14 J/(kg K)
  
37
Thermal Conductivity
22.60 W/m·K
  
99+
57.50 W/m·K
  
27
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.36 J/mol·K
  
99+
25.36 J/mol·K
  
99+
Thermal Expansion
5.70 µm/(m·K)
  
99+
6.30 µm/(m·K)
  
99+
Standard Molar Entropy
39.00 J/mol.K
  
39
41.50 J/mol.K
  
37
Enthalpy
  
  
Enthalpy of Vaporization
581.60 kJ/mol
  
9
753.10 kJ/mol
  
2
Enthalpy of Fusion
20.90 kJ/mol
  
11
31.40 kJ/mol
  
3
Enthalpy of Atomization
598.00 kJ/mol
  
10
782.00 kJ/mol
  
3