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Manipal Medical Manipal Medical Solved Paper-2002

  • question_answer
    The number of neutrons in the element\[_{4}B{{e}^{9}}\]is:

    A)  3                 

    B)  5

    C)  7                 

    D)  9

    Correct Answer: B

    Solution :

     We know that Atomic number = number of protons = number of electrons Mass number = number of proton\[+\]number of neutrons \[\therefore \]number of neutrons = mass number\[-\]atomic number \[=9-4=5\]


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