La-139 Isotope Applications:

Lanthanum-139 isotope (La-139 isotope, 139La isotope)

  • La-139 isotope is used for Cerium-139 (Ce-139 isotope, 139Ce isotope) radionuclide (radioisotope) production (can be used in life science for healthcare and medical applications and pharmaceuticals industries);
  • La-139 isotope is used for research in nuclear physics;

La-139 isotope is available to order from in La-139 oxide (La2O3) chemical form. Please contact us via request a La-139 quote to order La-139 isotope, to get La-139 price and to buy La-139 isotope.

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Properties of La-139 Isotope:

Properties of La-139 Isotope:LA-139
Natural Abundance (%)99.911
Atomic Mass (Da)138.9063533
Relative Isotopic Mass138.9063533
Neutron Number (N)82
Atomic Number (Z)57
Mass Number (A)139
Nucleon Number (A)139
Proton Number (Z)57
Quadrupole Moment0.2
g-factor (g value)0.795156
Electron Configuration Blockd
Melting Point (K)1193
Boiling Point (K)3737
Specific Heat0.197
Heat of Formation431
Thermal Conductivity13.4
Dipole Polarizability 215
Electron Affinity (kJ/mole)0.557546
Electronegativity (Pauling scale)1.1
Atomic Radius (pm)187
Covalent Radius (pm)195
VDW Radius (pm)278
Lattice Constant3.75
Crystal StructureDHCP
Jmol color#70d4ff

La-139 Information

Lanthanum is a silvery metallic element belonging to group 3 of the periodic table and oft considered to be one of the lanthanoids. It is found in some rare-earth minerals. 39 isotopes of lanthanum exist. There are 2 natural isotopes of lanthanum. One of them La-139 is stable and another one La-138 has a half-life of 10^10 to 10^15 years. It resembles the lanthanoids chemically. This element has a low to moderate level of toxicity, and should be handled with care. Lanthanum was discovered by C.G. Mosander in 1839.

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

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FAQ about La-139 Isotope:

What is La-139 isotope natural abundance?
Answer: 99.911 %

What is atomic mass for La-139 isotope?
Answer: 138.90635 Da

What is isotopic mass for La-139 isotope?
Answer: 138.90635

How many neutrons does La-139 isotope have?
Answer: 82

How many protons does La-139 isotope have?
Answer: 57

How many electrons does La-139 isotope have?
Answer: 57

What is atomic number for La-139 isotope?
Answer: 57

Is La-139 isotope stable?
Answer: Yes

Is La-139 isotope radioactive?
Answer: No

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