Symbol Ga Atomic radius: pm 122 Fusion: kJ/Mole 5.59
Name Gallium Ionic radius: pm (+3)62 Boiling point: °C 2204
Atomic number 31 Electron affinity 0.3 Melting point: °C 30
Atomic weight 69.72 1st  ion potential 5.10 Specific Heat Cap: J/(g K) 0.37
Classification Other metal Natural form Solid Thermal Cond: W/(cm K) 0.41
Configuration [Ar]3d104s2p1 Crystal structure Ortho Electrical Cond 0.0678
Oxidation states 3 Density 5.91 Abundance: mg/kg-crust 19
Electronegativity 1.81 Vaporization: kJ/Mole 254.0    
Gallium was discovered in 1875 by Paul-Émile Lecoq de Boisbaudran.  Soon afterward he isolated the metal and found that its properties coincided with those Dimitri Mendeleev had predicted a few years earlier for eka-aluminum. Uses - photocells, transistors