Not all radioactive changes in a nucleus result in an immediately stable nucleus. For small nuclei, an equal number of protons and neutrons is stable. But for larger nuclei electical repulsion between protons apparently makes a greater number of neutrons necessary for stability.& So a graph of the known stable isotopes is a peninsula that gradually curves.
Communicating technical information such as observations and findings is a skill used by scientists but useful for most others. If you need course credit, use your observations in your journal to construct a formal report.
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