138La Isotope

138la isotope 138la enriched 138la abundance 138la atomic mass 138la

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;

138La isotope is available to order from BuyIsotope.com in 138La oxide (La2O3) chemical form. Please contact us via request a 138La quote BuyIsotope.com to order 138La isotope, to get 138La price and to buy 138La isotope.

back to Lanthanum isotopes list


Properties of 138La Isotope:

Properties of 138La Isotope:138La
Natural Abundance (%)0.089
Atomic Mass (Da)137.907112
Relative Isotopic Mass137.907112
Neutron Number (N)81
Atomic Number (Z)57
Mass Number (A)138
Nucleon Number (A)138
Proton Number (Z)57
Half-life1.020E+11
Spin5
Quadrupole Moment0.39
g-factor (g value)0.742729
Group3
Period6
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

138La 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.

back to Lanthanum isotopes list

FAQ about 138La Isotope:

What is 138La isotope natural abundance?
Answer: 0.089 %

What is atomic mass for 138La isotope?
Answer: 137.90711 Da

What is isotopic mass for 138La isotope?
Answer: 137.90711

How many neutrons does 138La isotope have?
Answer: 81

How many protons does 138La isotope have?
Answer: 57

How many electrons does 138La isotope have?
Answer: 57

What is atomic number for 138La isotope?
Answer: 57

Is 138La isotope stable?
Answer: No

Is 138La isotope radioactive?
Answer: Yes

back to Lanthanum isotopes list