Question

Why is Z < N for the heavier nuclei?​

Answer 1

Answer:

Radioactive decay occurs because a nuclei is unstable. It emits alpha particles, beta particles or gamma rays to become more stable.

For light isotopes (up to Z=20) the stable nuclei have equal numbers of protons and neutrons for heavier nuclei to be stable they need to have more neutrons than protons.

Explanation:

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