12th Class Chemistry Sample Paper Chemistry Olympiad Sample Paper-3

  • question_answer
    The radionuclide \[_{90}^{234}\]Th undergoes two successive p-decays followed by one a-decay.
    The atomic number and the mass number respectively of the resulting radionuclide are

    A)  94 and 230      

    B)  90 and 230

    C)   92 and 230     

    D)  92 and 234

    Correct Answer: B


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