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Tantalum
Electron Configuration 2,8,18,32,11,2
Electron Configuration [Xe]] 4f14 5d3 6s2
Electronegativity 1.5
Enthalpy of Fusion 31.4 kJ mol-1
Enthalpy of Vaporisation 758.2 kJ mol-1
Heat Capacity 25.36 J mol-1 K-1
Thermal Conductivity 57.5 W m-1 K-1
Thermal Expansion 6.3 μm m-1 K-1
Magnetic ordering No data
Electrical resistivity 131 Ω m
Speed of sound 3400 m s-1
Young's modulus 186 GPa
Shear modulus 3400 GPa
Bulk modulus 200 GPa
Poisson ratio 0.34
Mohs hardness 6.5
Vickers hardness 873 MPa
Brinell hardness 800 MPa
Atomic Radii
Atomic Radius 145 pm
Bohr Radius 200 pm
Covalent Radius 138 pm
Van der Waals 0 pm
Oxidation States
Main Ta+5
Other Ta-3, Ta-1, Ta+1, Ta+2, Ta+3, Ta+6
Ionisation Energies (kJ mol-1) show graph
M - M+ 761
M+ - M2+ 1500
M2+ - M3+ 2100
M3+ - M4+ 3200
M4+ - M5+ 4300
Covalent Bonds (kJ mol-1)