Practice Problem: Isotopic Abundance and Atomic Mass
Production of Radioisotopes
CHEMISTRY 101: Natural abudance of an isotope
Stable Isotopes 1
Natural isotopes are either stable isotopes, radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (e.g. bismuth-209, with a half-life of 1.9 * 1019 years, potassium-40 with a half-life of 1.251(3)×109 y), daughter products of those isotopes (e.g. 234Th, with a half-life of 24 days) or cosmogenic elements. The heaviest stable isotope is lead-208, but the heaviest 'natural' isotope is U-238.
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