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Accordingly, it is important and useful to measure stability in more quantitative terms.

A uniform scale of nuclear stability, one that applies to stable and unstable isotopes alike, is based on a comparison of measured isotope masses with the masses of their constituent electrons, protons, and neutrons.

U to an isotope of uranium widely used for nuclear power generation and nuclear weapons fabrication.

Modeled on an analogy to a liquid drop, the first term represents the favourable contribution to the binding of the nucleus made by short-range, attractive nuclear forces between neutrons and protons.With considerable prescience, he extended the scope of his conclusion to include not only radioactive species but stable elements as well.A few years later, Soddy published a comparison of the atomic masses of the stable element lead as measured in ores rich in uranium and thorium, respectively.A large collection of atoms with the same atomic number constitutes a sample of an element. These substances were thought to be elements and accordingly received special names.A bar of pure uranium, for instance, would consist entirely of atoms with atomic number 92. Uranium ores, for example, yielded ionium, and thorium ores gave mesothorium.

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