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Neodymium - Wikipedia ... Neodymium
Naturally occurring neodymium (60 Nd) is composed of 5 stable isotopes, 142 Nd, 143 Nd, 145 Nd, 146 Nd and 148 Nd, with 142 Nd being the most abundant (27.2% natural abundance), and 2 long-lived radioisotopes, 144 Nd and 150 Nd. In all, 33 radioisotopes of neodymium have been characterized up to now, with the most stable being naturally ...
Rare-earth element
Samarium–neodymium dating. Samarium–neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites, based on the alpha decay of the long-lived samarium isotope (147. Sm) to the stable radiogenic neodymium isotope (143. Nd).
Radiometric dating
List of elements by stability of isotopes
Abundance of elements in Earth's crust
e. Heavy metals are metallic elements with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary depending on the author and context and has been argued should not be used. [2][3] A heavy metal may be defined on the basis of density, atomic number or chemical behaviour.