Isotopes of lanthanum

Lanthanum (La) has a few isotopes, but it has only one stable isotope: lanthanum-138 (¹³⁸La). This isotope accounts for nearly all naturally occurring lanthanum. In addition to the stable isotope, lanthanum has several radioactive isotopes. These isotopes include: 1. **Lanthanum-137 (¹³⁷La)**: A beta-emitting isotope with a half-life of about 6.