Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 38

9702Atoms, nuclei and radiation

A nucleus of francium-221 ($^{221}_{87}$Fr) decays into a nucleus of bismuth-209 ($^{209}_{83}$Bi) in several steps. Which particles could be emitted?

A2 α-particles and 4 β– particles
B2 α-particles and 4 β+ particles
C3 α-particles and 2 β– particles
D3 α-particles and 2 β+ particles

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Correct answer: C. 3 α-particles and 2 β– particles

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