JEE Main & Advanced Chemistry Structure of Atom Question Bank Critical Thinking

  • question_answer The electronic configuration of a dipositive metal \[{{M}^{2+}}\] is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be [MNR 1984, 89; Kerala PMT 1999]

    A)                 30          

    B)                 32

    C)                 34          

    D)                 42

    Correct Answer: A

    Solution :

               Metal is \[_{56}{{M}^{2+}}\,(2,\,8,\,14)\] than \[n=A-Z\]                                                                          \[=56-26=30\].

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