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LANTHANUM (57La138.906)

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Element Description

Lanthanum is silvery-white, soft, ductile, and malleable. It oxidizes rapidly when exposed to air and its reaction with water is temperature dependant. It is one of the most reactive of the rare earth metals. The metal is superconducting at approximately 6K.

Property Name Property Value Property Name Property Value
Atomic Code (57La138.906) Electronegativity 1.1Pauling's
CAS # 7493-91-0 Covalent Radius 1.69Angstroms
Electrical Resistivity @ 298°C 79.8µΩ-cm
Melting Point 920°C Crystal Structure Hexagonal
Boiling Point 3464°C Compressibility 4.04x10-6cm2/kg
Density 6.17g/cm3 Thermal Neutron Cross Section 8.9barns/atom
Themal Conductivity 0.033cal/cm2/cm/s/°C Magnetic Moment 0.49Bohr magnetons
Specific Heat @ 25°C 0.045cal/g°C Magnetic Susceptibility 101x10-6emu/mol
Heat of Fusion 1.5k-cal/g-atom Tensile Strength 18,900psi
Heat of Vaporization 96k-cal/g-atom Yield Strength 18,200psi
Atomic Volume 22.5W/D Standard Electrode Potential +2.4volts
First Ionization Energy 129K-cal/g-mole


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