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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Nucleus, Nuclear Reaction

  • question_answer
    If the mass number of an atom is \[A=40\] and its electron configuration is \[1{{s}^{2}},\ 2{{s}^{2}},\ 2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}\], the number of neutrons and protons in its nucleus will be  [RPMT 2002]

    A)            22, 18                                      

    B)            18, 22

    C)            20, 20                                       

    D)            18, 18

    Correct Answer: A

    Solution :

                       Number of protons = 2 + 2 + 6 + 2 + 6 = 18 Number of neutrons = 40 ? 18 = 22.


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