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Identify the pairs which are not of isotopes?

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${}_{6}^{12}X, {}_{6}^{13}Y$

${}_{17}^{35}X, {}_{17}^{37}Y$

${}_{6}^{14}X, {}_{7}^{14}Y$

${}_{4}^{8}X, {}_{5}^{8}Y$

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Detailed Solution

(a) ${}_{6}^{12}X and {}_{6}^{13}Y$ have same atomic number but different mass number.

(b) ${}_{17}^{35}X and {}_{17}^{37}Y$ have same atomic number but different mass number.

Both these pairs are isotopes to each other.

c) ${}_{6}^{14}X and {}_{7}^{14}Y$ have different atomic number but same mass number.

(d) ${}_{4}^{8}X and {}_{5}^{8}Y$ have different atomic number but same mass number.

Both these pairs are isobars to each other.

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