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Question
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"`
Solution
(i) Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. `""^58"A"_58` and `""^58"B"_28` are not isotopes because they have different atomic numbers.
(ii)`""^79"X"_35` and `""^80"Y"_35` are isotopes as they have same atomic number.
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