What is the atomic weight of lead (Pb)?

The atomic weight of lead (Pb) is approximately 207.2 atomic mass units. This value represents the weighted average of the masses of the naturally occurring isotopes of lead, taking into account their relative abundances. Lead has four stable isotopes, with lead-206, lead-207, and lead-208 being the most common. The atomic weight reflects not just the mass of a single isotope but an average that incorporates all isotopes and their proportions found in nature. In contrast, the other numbers listed do not accurately represent the atomic weight of lead, aligning with the fact that lead's atomic weight is distinctly in the range of the 200s, emphasizing the importance of understanding actual isotopic compositions and their contributions to the atomic mass.