Multiple choice

In which of the following nuclear reactions, 8α and 6β particles have been emitted?

  1. 92U23882Pb206

  2. 90Th22883Bi212

  3. 92U23589Ac227

  4. 92U23582Pb207

  5. 92U23590Th231

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A Correct answer
Explanation

92U23882Pb206 Change in mass number = 238 - 206 = 32 The mass number changes only because of α-particle emission Hence, number of α-particles emitted = 32/4 = 8 After emission of 8 α-particles, the atomic number should change by 2 x 8 = 16 Actual change in atomic number = 92 - 82 = 10 Hence, number of β-particles emitted = 16 - 10 = 6