Answer:
(i) Yes, they are the isotopes of the same element because they have same atomic number \[(Z=3)\]. (ii) The isotope \[_{3}^{7}X\] has 3 protons and 4 neutrons while the isotope \[_{3}^{4}\Upsilon \] has 3 protons and 1 neutron. Due to the presence of a greater number of neutrons in \[_{3}^{7}X\] , the strong attractive nuclear force dominates over the electrostatic repulsion between the protons. So \[_{3}^{7}X\] is more stable than \[_{3}^{4}\Upsilon \].
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