Germanium
Elemental State Ge
Electron Configuration 1s22s22p63s23p63d104s24p2
First Ionization Potential 7.899 eV
Electron Affinity 1.233 eV
Z* 6.780 (Clementi-Raimondi)
Pauling Electronegativity 2.01
Covalent Radius 1.22 Å
Metallic Radius 1.39 Å
Ionic Radius 0.87 Å Ge2+ coordination number = 6

0.530 Å Ge4+ coordination number = 4

0.670 Å Ge4+ coordination number = 6

van der Waal's Radius  
Melting Point 938.25 oC
Boiling Point 2833 oC
Density 5.323 g/cm3
Other Properties