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(D) For light nuclei,stability is achieved when the number of neutrons is approximately equal to the number of protons,i.e.,$N \approx Z$ or $\frac{N}

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$N \ge Z$

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(D) For light nuclei,stability is achieved when the number of neutrons is approximately equal to the number of protons,i.e.,$N \approx Z$ or $\frac{N}{Z} = 1$.For heavier nuclei,the electrostatic repulsion between protons increases,requiring more neutrons to provide additional strong nuclear force to maintain stability. Thus,for heavier nuclei,$N > Z$,which implies $\frac{N}{Z} > 1$.Combining these two conditions,the general relation for a stable nucleus is $N \ge Z$.

For a nucleus to be stable,the correct relation between neutron number $N$ and proton number $Z$ is

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