Physics · Unit 1 · Ionising radiation and nuclear reactions · Nuclear model and stability

Explain the stability of a nuclide in terms of the operation of the strong nuclear force over very short distances, electrostatic repulsion, and the relative number of protons and neutrons in the nucleus.

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Explain that more energy is released per nucleon in nuclear fusion than in nuclear fission because a greater percentage of the mass is transformed into energy.
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Explain why protons in the nucleus repel each other.
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