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

  • question_answer
    The letters \[X,\,\,Y\] and \[Z\] represent different atoms. \[_{19}^{40}X\,\,\,\,\,_{19}^{39}Y\,\,\,\,\,\,\,_{20}^{40}Z\] What can be deduced from the proton numbers and nucleon numbers of\[X,\,\,Y\] and\[Z\]?

    A)  \[X\] and \[Y\] are the same elements.  

    B)  \[X\] and \[Z\] are the same elements.

    C)  \[X\] has more protons than \[Y\].

    D)  \[Z\] has more neutrons than\[Y\].

    Correct Answer: A

    Solution :

     Elements \[X\] and \[Y\] have same proton number, hence, they are the same elements. The number of neutrons of \[X,\,\,Y\] and \[Z\] are \[21,\,\,20,\,\,20\] respectively.


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