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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Nucleus (Stability and Reaction)

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    The radionucleide \[_{90}^{234}Th\] undergoes two successive \[\beta \]-decays followed by one \[\alpha \]-decay. The atomic number and the mass number respectively of the resulting radionucleide are                      [AIEEE 2003]

    A)                 92 and 234          

    B)                 94 and 230

    C)                 90 and 230          

    D)                 92 and 230

    Correct Answer: C

    Solution :

                    \[_{90}T{{h}^{234}}\xrightarrow{-\beta }{{\,}_{91}}{{X}^{234}}\xrightarrow{-\beta }{{\,}_{92}}{{Y}^{234}}\]\[\xrightarrow{-\alpha }{{\,}_{90}}{{Z}^{230}}\].


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