Which among the following is an example of isobars?

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${}_{62}^{150}{Sm} and {}_{63}^{150}{Eu}$

${}_{52}^{129}{Te} and {}_{51}^{128}{Sb}$

${}_{20}^{40}{Ca} and {}_{11}^{23}{Na}$

${}_{43}^{98}{Tc} and {}_{43}^{99}{Tc}$

answer is B.

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Detailed Solution

The atoms of different elements having the same mass number (or atomic mass) but different atomic number are termed isobars. Among the given elements ${}_{62}^{150}{Sm} and {}_{63}^{150}{Eu}$ have same mass number and different atomic number, so they are the example of isobars.

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