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

  • question_answer
    When a radioactive nucleus emits an \[\alpha \]-particle, the mass of the atom                 [NCERT 1973, 82]

    A)                 Increases and its at. number decreases

    B)                 Decreases and its at. number decreases

    C)                 Decreases and its at. number increases

    D)                 Remains same and its at. number decreases

    Correct Answer: B

    Solution :

              \[_{A}{{X}^{M}}\xrightarrow{-\alpha }{{\,}_{A-2}}{{Y}^{M-4}}\]


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