How is Figure 25.3 used to predict the type of decomposition for unstable (radioactive) isotopes?

Data given in Figure 25.3

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Number of neutrons 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 Isotopes in this neutron- rich region (with n/p >> 1) decay by B emission to give a lower n/p ratio. B emission 10 20 Positron emission or electron capture 30 40 50 60 Number of protons a emission... n/p = 1 . Stable Radioactive 70 80 90 100 Isotopes in this region decay by a emission to give a lower atomic number. Isotopes in this neutron- poor region decay by positron emission or electron capture to give a higher n/p ratio.