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Q.

Which of the following pairs are isotopes?

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a

X_{209}^{84}, X_{210}^{84}

b

Z_{232}^{90}

,

Z_{231}^{91}

c

A_{79}^{35}

,

A_{80}^{36}

d

B_{192}^{28}

,

B_{192}^{25}

answer is A.

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Detailed Solution

X_{209}^{84}

,

X_{210}^{84}

are isotopic pairs.
Atoms belonging to the same element can have different numbers of neutrons due to which the mass number of each element differs while the atomic number remains the same. The different possible versions of each element are called isotopes. For example, Hydrogen and deuterium are two isotopic pairs which have the same atomic number 1 and mass numbers as 1 and 2 respectively.

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