Lanthanum

Atomic Number: 57

Name: Lanthanum

Atomic symbol: La

Atomic Weight: 138.906

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶5d¹6s²

Ionization energies: 538 kJ/mol

Melting Point: 921^oC

Boiling Point: 3457^oC

Density: 6.1 g/cm³

Ionic radius: 1.39 angstroms (+1), 1.06 angstroms (+3)

Metallic radius: 1.88 angstroms