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Decay Chains When a nucleus decays its product is not always stable and may itself decay. A sequence of decays is known as a decay chain. The decay chain of Radium is shown below. For each of the decays fill in the table, labelling which form of decay (alpha, beta or gamma) caused the change. One example is given. Decay Chain of Radium-226 Ra-226 decays to Rn-222 Rn-222 decays to Po-218 . Po-218 decays to Pb-214 Pb-214 decays to Bi-214 Bi-214 decays to Po-214 Po-214 decays to Pb210 Pb-210 decays to Bi-210 . Bi-210 decays to Po-210- . Po-210 decays to Pb 206 Pb-206 is stable Follow up questions 1. What is the overall change in mass number and proton number? 2. How can certain elements appear more than once in the chain? 3. Write a decay equation that shows the total chain between Ra-226 and Pb-206