Symbol Ge Atomic radius: pm 123 Fusion: kJ/Mole 36.94
Name Germanium Ionic radius: pm (+4)53 Boiling point: C 2833
Atomic number 32 Electron affinity 1.23 Melting point: C 939
Atomic weight 72.61 1st  ion potential 7.90 Specific Heat Cap: J/(g K) 0.32
Classification Metalloid Natural form Solid Thermal Cond: W/(cm K) 0.60
Configuration [Ar]3d104s2p2 Crystal structure FCC Electrical Cond 1.45x10-8
Oxidation states 4 Density 5.32 Abundance: mg/kg-crust 1.5
Electronegativity 2.01 Vaporization: kJ/Mole 334.0    
Although germanium was not discovered until 1886 by Clemens Winkler, a German chemist, its existence, properties, and position in the periodic table had been predicted in 1871 by the Russian chemist Dimitri Ivanovich Mendeleev, who called the hypothetical element ekasilicon Uses - semiconductor, gamma radiation detection, transistors, wide-angle lenses, phosphor in fluorescent lamps