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KVPY Sample Paper KVPY Stream-SX Model Paper-2

  • question_answer
    The nuclei of elements X, Y and Z have same number of protons, but different numbers of neutrons. According to mendeleef periodic table, the elements X,Y and Z

    A) Belong to same group and same period

    B) Belong to different group and different periods

    C) Belong to same group and different periods

    D) Are isotopes, which do not have different positions

    Correct Answer: D

    Solution :

    [d] Isotopes have same number of protons (i.e. same atomic number). So they occupy same position in the periodic table. However, due to different numbers of neutrons their atomic weights are different.


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