Nuclear stability
Nuclides can be grouped on the basis of nuclear stability, i.e. stable and unstable nucleus. The most acceptable theory about the atomic nuclear stability is based upon the fact that the observed atomic mass of all known isotopes (except hydrogen) is always less from the sum of the weights of protons and neutrons present in it. Electron (b- particle) from a radioactive nucleus may be regarded as derived from a neutron in the following way,
Similarly, photons are produced from internal stresses within the nucleus.
The stability of nucleus may be discussed in terms of any one of the following,
1. Nuclear Binding Energy and the Mass defect
2. Packing fraction
3. Magic number
4. Neutron-proton ratio or causes of radioactivity
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