Lead-206 is a stable isotope of the element lead, which has an atomic number of 82. It is one of the end products of the radioactive decay of uranium and thorium, making it significant in the study of nuclear physics and geochronology. Lead-206 has a mass number of 206 and does not undergo further radioactive decay. This isotope is commonly found in nature, particularly in ore deposits and mineral formations. It plays a crucial role in dating geological samples through the uranium-lead dating method, which helps scientists determine the age of rocks and minerals.