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The atomic species A and B have differen...

The atomic species A and B have different number of protons but the same number of nucleons. One the other hand, and atomic species X and Y have the same number of protons but different number of nucleons. Which pair is an example of isobars ? Why ?

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The correct Answer is:
A and B ; Due to different number of protons, they have different atomic numbers and due to same number of nucleons, they have the same number
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