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A new radionucleide is obtained from the radionucleide 90 234 T h through two successive β -decays followed by one α -decay. The atomic number and the mass number respectively of the resulting radionucleide is

Options

  1. A92 and 234
  2. B94 and 230
  3. C90 and 230
  4. D92 and 230

Correct answer

C. 90 and 230

Step-by-step solution

90 T h 234 → - β 91 X 234 → - β 92 Y 234 → - α 90 Z 230

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