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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Causes of radioactivity and Group displacement law

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    An element with atomic number 84 and mass number 218 loses one \[\alpha \]-particle and two \[\beta \]-particles in three successive stages, the resulting element will have [NCERT 1979; CPMT 1990]

    A)                 At. no. 84 and mass number 214

    B)                 At. no. 82 and mass number 214

    C)                 At. no. 84 and mass number 218

    D)                 At. no. 82 and mass number 218

    Correct Answer: A

    Solution :

              \[_{84}{{A}^{218}}\to \,{{\,}_{84}}{{B}^{214}}+\,{{\,}_{2}}H{{e}^{4}}+2{{\,}_{-1}}{{e}^{0}}\].


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