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AIIMS AIIMS Solved Paper-1999

  • question_answer
    If magnesium atom having atomic number 12 has an isotope with mass number 26, then the number           of protons, neutrons and electrons respectively of the atom are

    A)  12, 14, 12           

    B)  12, 12, 14           

    C)                                         14, 12, 12        

    D)         12, 12, 12.                   

    Correct Answer: A

    Solution :

    Isotopes are nuclei that have same atomic number but different atomic mass. Atomic number of the isotope = 12 \[\Rightarrow \] Number of electrons and protons =12 Number of neutrons = At. mass - Atomic no. \[=26-12=14\]


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