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You are given two nuclides ""(3)^(7)X an...

You are given two nuclides `""_(3)^(7)X and ""_(3)^(4)Y`.
a. Are they the isotopes of the same element ?
b. Which one of the two is likely to be more stable?
c. Give reason.

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a. Both are isotopes of the same element since they have the same atomic number.
b. `""_(3)^(7)X`
c. Nuclides with greater number of neutrons is stable. So here `""_(3)^(7)X` is more stable than `""_(3)^4Y`.
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