Draw an energy-level diagram, similar to Figure 30.9, for the protons and neutrons in \({ }^{11} \mathrm{Be}\). Do you expect this nucleus to be stable?

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FIGURE 30.9 Nuclear energy-level diagrams of 1B, 1C, and N. AC nucleus is in its lowest possible energy state. Energy 12C 2 2 4 Neutrons Protons Maximum numbers of neutrons and protons in each level. A 12B nucleus could lower its energy if a neutron could turn into a proton. Energy 12B 2 2 4 4 Neutrons 2 Protons A N nucleus could lower its energy if a proton could turn into a neutron. Energy 12N 2 4 Neutrons Protons