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9th Class Science Structure of the Atom Question Bank Structure of the Atom

  • question_answer
    What is the ratio of the number of neutrons present in potassium and magnesium atoms with mass numbers \[39\] and \[24\] respectively?

    A) \[19:12\]           

    B)        \[5:3\]  

    C) \[5:6\]               

    D)        \[4:3\]

    Correct Answer: B

    Solution :

     Number of neutrons in \[K\] atom\[=39-19=20\] Number of neutrons in \[Mg\] atom\[=24-12=12\] Ratio\[=20:12=5:3\]


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