Lanthanum-138 isotope (La-138 isotope, 138La isotope)
Lanthanum-138 isotope is available to order from BuyIsotope.com in Lanthanum-138 oxide (La2O3) chemical form. Please contact us via request a Lanthanum-138 isotope quote BuyIsotope.com to order Lanthanum-138 isotope, to get Lanthanum-138 price and to buy Lanthanum-138 isotope.
Lanthanum-139 isotope (La-139 isotope, 139La isotope)
Lanthanum-139 isotope is available to order from BuyIsotope.com in Lanthanum-139 oxide (La2O3) chemical form. Please contact us via request a Lanthanum-139 isotope quote BuyIsotope.com to order Lanthanum-139 isotope, to get Lanthanum-139 price and to buy Lanthanum-139 isotope.
|Properties of Lanthanum Isotopes:||LANTHANUM-138||LANTHANUM-139|
|Natural Abundance (%)||0.089||99.911|
|Atomic Mass (Da)||137.907112||138.9063533|
|Relative Isotopic Mass||137.907112||138.9063533|
|Neutron Number (N)||81||82|
|Atomic Number (Z)||57||57|
|Mass Number (A)||138||139|
|Nucleon Number (A)||138||139|
|Proton Number (Z)||57||57|
|g-factor (g value)||0.742729||0.795156|
|Electron Configuration Block||d||d|
|Melting Point (K)||1193||1193|
|Boiling Point (K)||3737||3737|
|Heat of Formation||431||431|
|Electron Affinity (kJ/mole)||0.557546||0.557546|
|Electronegativity (Pauling scale)||1.1||1.1|
|Atomic Radius (pm)||187||187|
|Covalent Radius (pm)||195||195|
|VDW Radius (pm)||278||278|
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.