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

  • question_answer
    An element \[X\] has two isotopes, which may be represented as \[^{238}X\] and\[^{235}X\]. How does \[^{238}X\] differ from\[^{235}X\]?

    A)  \[^{238}X\]has \[3\] more protons and \[3\] more electrons than\[235\].

    B)  \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\].

    C)  \[^{238}X\] has \[3\] more neutrons, but the electrons or protons are same as\[235\].  

    D)  \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\].

    Correct Answer: C

    Solution :

     Since, the number of protons and electrons are the same in both isotopes, the difference in their number of neutrons is\[238-235=3\].


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