Interpretation:
Lead-207 is expected to be unstable or stable nuclide has to be explained.
Concept Introduction:
Radioactive nuclides undergo disintegration by emission of radiation. All the radioactive nuclide do not undergo the decay at a same rate. Some decay rapidly and others decay very slowly. The nuclear stability can be quantitatively expressed by using the half-life.
The radioactive decay occurs till a stable nucleus is formed. Radioactive series is a decay process that occurs in series which begins with the long-lived radionuclide and ends up with nuclide having less
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