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Uttarakhand PMT Uttarakhand PMT Solved Paper-2008

  • question_answer
    The electronic configuration of a dipositive ion\[{{M}^{2+}}\]is 2, 8, 14 and its mass number is 56. The number of neutrons present is

    A)  32            

    B)  42

    C)  30            

    D)  34

    Correct Answer: C

    Solution :

     Number of electrons in \[{{M}^{2+}}=24\] \[\therefore \]number of electrons in \[M=26\] ie, atomic number \[(Z)=26\] Mass number \[(A)=56\] \[\therefore \]number of neutrons\[=A-Z=56-26=30.\]


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