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## Q. 12.7

Only four stable nuclides have odd numbers for both N and Z. Predict whether adding both a proton and a neutron to each of these nuclides, ${ }_{1}^{2} H ,{ }_{3}^{6} Li ,{ }_{5}^{10} B \text {, and }{ }_{7}^{14} N$, will produce a stable nucleus. Look up in Appendix 8 whether they are stable or not.

## Verified Solution

Adding a proton and a neutron to each nuclide will make them each even-even. There is a good likelihood that each new nuclide is stable, because nucleons prefer to have even numbers.

When we look up the nuclides in Appendix 8, we find that only ${ }_{4}^{8} Be$ is unstable, which is a special case because it decays to two alpha particles. Alpha particles are particularly stable because both Z and N are equal to 2, which is a “magic number” (see Problem 68).