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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Atomic number, Mass number Atomic species

  • question_answer
    Number of protons, neutrons and electrons in the element \[_{89}^{231}Y\] is                                  [AFMC 1997]

    A)                 89, 231, 89          

    B)                 89, 89, 242

    C)                 89, 142, 89          

    D)                 89, 71, 89

    Correct Answer: C

    Solution :

                    In \[Xe_{89}^{231}\] number of protons and electrons is 89 and No. of neutrons = A ? Z = 231 ? 89 = 142.


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