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

  • question_answer
      Composition of the nuclei of two atomic species 'X' and 'Y' are given below: X                             Y                 Protons                                8                              8 Neutrons             8                              10 Give the mass number of 'X' and 'Y'. What is the relationship between the two species?

    Answer:

                      (i)Atomic mass of element 'X' = Number of protons + Number of neutrons                                                 = 8 + 8 =16 u (ii) Atomic mass of element 'Y' = Number of neutrons + Number of protons                                 = 10 = 8 =18 u Relationship between X and Y: The atomic number of both the elements is same but their atomic masses are different. Hence, they are isotopes of each other.


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