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Which of the following pairs are isotope...

Which of the following pairs are isotopes ? Give reasons for your choice :
(i) `._(26)^(58)A,._(28)^(58)B` or (ii) `._(35)^(79)X,._(35)^(80)Y`.

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The correct Answer is:
`._(35)^(79) ._(35)^(80Y` ; Same atomic number of 35
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
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