Lanthanum
Elemental State La
Electron Configuration 1s22s22p63s23p63d104s24p64d105s25p66s25d1
First Ionization Potential 5.577 eV
Electron Affinity 0.5 eV (calculated)
Z*  
Pauling Electronegativity 1.10
Covalent Radius 1.69 Å
Metallic Radius 1.88 Å
Ionic Radius 1.172 Å La3+ coordination number = 6

1.300 Å La3+ coordination number = 8

van der Waal's Radius  
Melting Point 918 oC
Boiling Point 3464 oC
Density 6.145 g/cm3
Other Properties