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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Topic Test - Nuclear Physics and Radioactivity

  • question_answer
    In \[_{88}R{{a}^{226}}\]nucleus, there are                    

    A) 138 protons and 88 neutrons

    B) 138 neutrons and 88 protons

    C) 226 protons and 88 electrons

    D) 226 neutrons and 138 electrons

    Correct Answer: B

    Solution :

    [b] \[_{z}{{X}^{A}}{{=}_{88}}R{{a}^{226}}\]
    Number of protons = Z = 88
    Number of neutrons \[=A-Z=226-88=138\].


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