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The nuclear stability curve depicts the binding energy per nucleon as a function of the mass number (A) of atomic nuclei. The curve shows that nuclei with intermediate mass numbers, around A = 56 for iron, have the highest binding energy per nucleon, indicating the greatest stability.
At a short range (around 1–3 fm), nucleons are bound by the strong nuclear force. Below 1 fm, the strong nuclear force is repulsive in order to prevent the nucleus from collapsing. At longer ranges, the electromagnetic force acts between protons, so more protons cause more instability.
Nuclear instability worksheets, questions and revision for A-level Physics. All the revision you need in one place.
Nuclear stability refers to the tendency of a nucleus of an atom to decay, which means to change into something else. If the isotope of an element (called a nuclide) is unstable (not stable), the nuclide has the tendency of emitting some kind of radiation, and is called radioactive. Radioactivity is associated with unstable nuclides.
Definition. Nuclear stability refers to the ability of an atomic nucleus to maintain its structure over time without undergoing radioactive decay. A stable nucleus has a balanced ratio of protons and neutrons, which minimizes the forces that could lead to instability.
