Physics · Unit 1 · Ionising radiation and nuclear reactions · Nuclear model and stability
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The diagram shows the neutron-to-proton ratios for four isotopes labelled P, Q, R and S, plotted against their atomic numbers. The shaded region represents the band of stability. Which isotope is most likely to undergo natural radioactive decay by beta-minus emission?
Why does a nucleus with a high neutron-to-proton ratio undergo beta-minus decay?
Which statement best explains why a nucleus with a neutron-to-proton ratio significantly greater than 1:1 undergoes natural radioactive decay?