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JEE Main2003ChemistryClassification of Elements and Periodicity in PropertiesActual

The radionucleide ₉₀²³⁴ Th undergoes two successive -decays followed by one -decay. The atomic number and the mass number respectively of the resulting radionucleide are

Options

  1. A94 and 230
  2. B90 and 230
  3. C92 and 230
  4. D92 and 234

Correct answer

B. 90 and 230

Step-by-step solution

₉₀²³⁴ Th - ₉₁²³⁴ X - ₉₂²³⁴ Th -- ₉₀²³⁰ Th

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