Tantalum
Elemental State Ta
Electron Configuration 1s22s22p63s23p63d104s24p64d104f145s25p66s25d3
First Ionization Potential 7.550 eV
Electron Affinity 0.322 eV
Z*  
Pauling Electronegativity 1.5
Covalent Radius 1.38 Å
Metallic Radius 1.47 Å
Ionic Radius 0.86 Å Ta3+ coordination number = 6

0.82 Å Ta4+ coordination number = 6

0.78 Å Ta5+ coordination number = 6

0.88 Å Ta5+ coordination number = 8

van der Waal's Radius  
Melting Point 3017 oC
Boiling Point 5458 oC
Density 16.654 g/cm3
Other Properties