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The radioactive isotope 90 234 Th undergoes two successive β - decay followed by α decay. The atomic number and the mass number respectively of the resulting isotope are

Options

  1. A92 and 237
  2. B94 and 230
  3. C90 and 230
  4. D92 and 230

Correct answer

C. 90 and 230

Step-by-step solution

9 0 Th 2 3 4 ⟶ - 2 β 9 2 Χ 2 3 4 ⟶ - α 9 0 Th 2 3 0 Elimination of 1 α and 2 β particles give isotope.

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