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Question

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.

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