From the following nuclei, select the pairs of isotopes. (i)23892U(ii)23490Th(iii)23492U(iv)23491Pa
A
(i) and (iii) are isotopes
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B
(i) and (iv) are isotopes
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C
(i) and (ii) are isotopes
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D
(ii) and (iii) are isotopes
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Solution
The correct option is A (i) and (iii) are isotopes Isotopes are species that have the same atomic number but different mass numbers. (i) and (iii) are isotopes since they have the same atomic number.