Question
$\mathrm{He}_2{ }^3$ and $\mathrm{He}_1{ }^3$ nuclei have the same mass number. Do they have the same binding energy?
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Answer
The nuclei $\mathrm{{He}_2 }^3$ and $\mathrm{He}_1{ }^3$ have the same mass number. $\mathrm{He}_2{ }^3$ has two protons and one neutron. $\mathrm{He}_2{ }^3$ has one proton and two neutrons. As He 3 has only one proton hence the repulsive force between protons is missing in ${ }_1 \mathrm{He}^3$, so the binding energy of ${ }_1 \mathrm{He}^3$ is greater than that of ${ }_2 \mathrm{He}^3$.
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