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Physics (AS & A Level) · May / June 2021 · Paper 11 · Question 39

9702Atoms, nuclei and radiation

A nucleus of uranium, ^{235}_{92}U, undergoes a series of decays. During the series of decays, two α-particles and one β⁻ particle are emitted. As a result, a nucleus of actinium, Ac, is formed. What is the correct notation for the nuclide of actinium that is formed?

  1. A^{227}_{87}Ac
  2. B^{227}_{89}Ac
  3. C^{231}_{87}Ac
  4. D^{231}_{89}Ac

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Correct answer: B. ^{227}_{89}Ac

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