Technetium
Elemental State Tc
Electron Configuration 1s22s22p63s23p63d104s24p65s24d5
First Ionization Potential 7.28 eV
Electron Affinity 0.55 eV (calculated value)
Z*  
Pauling Electronegativity 2.10
Covalent Radius 1.56 Å
Metallic Radius 1.35 Å
Ionic Radius 0.785 Å Tc4+ coordination number = 6
van der Waal's Radius  
Melting Point 2157 oC
Boiling Point 4265 oC
Density 11.50 g/cm3 (calculated value)
Other Properties All isotopes are radioactive

97Tc, half-life = 2.6×106 years

98Tc, half-life = 4.2×106 years

95mTc, half-life = 61 days