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Worksheet: Radioactive Decay Chains


Astatine-218 undergoes beta decay to Radon-218. Radon-218 undergoes alpha decay to polonium-214. This is shown in the following nuclear equation.

What is the value of 𝑟 in the equation?

What is the value of 𝑠 in the equation?


Which type of nuclear radiation has no mass?

  • ABeta particles
  • BAlpha particles
  • CNeutrons
  • DGamma rays


The diagram shows a beryllium-11 nucleus undergoing two-step radioactive decay. Red circles represent protons, gray circles represent neutrons, and blue circles represent electrons. What isotope is produced through this reaction?