Question

He₂³ and He₁³ nuclei have the same mass number. Do they have the same binding energy?

Answer 1

The nuclei He₂³ and He₁³ have the same mass number. He₂³ has two protons and one neutron. He₂³ has one proton and two neutrons. As He³ has only one proton hence the repulsive force between protons is missing in ₁He³, so the binding energy of ₁He³ is greater than that of ₂He³.