138La Isotope Information and Examples of Enriched 138La Applications:

Lanthanum-138 isotope (La-138 isotope, 138La isotope)

  • 138La isotope is used for as a marker in isotopic dilution analysis;

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138La Properties:

Property138La
Number of Protons138
Abundance0.0008881
Atomic Number57
Atomic Radius187
Atomic Mass137.9
Spin5
Quadrupole Moment0.39
Electronegativity (Paulig)1.1
Electron Configuration Blockd
VDW Radius (mm3)278
Mass Uncertainty3e-05
g-factor (g value)0.7427
Half Life1.02e+11

Lanthanum Information

(From the Greek word lanthanein, to line hidden) Silvery metallic element belonging to group 3 of the periodic table and oft considered to be one of the lanthanoids. Found in some rare-earth minerals. Twenty-five natural isotopes exist. La-139 which is stable, and La-138 which has a half-life of 10^10 to 10^15 years. The other twenty-three isotopes are radioactive. It resembles the lanthanoids chemically. Lanthanum has a low to moderate level of toxicity, and should be handled with care. Discovered in 1839 by C.G. Mosander.

It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses.

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