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Although it is not obvious at first, -decay increases the ratio of neutrons to protons.Consider what happens during the -decay of The difference between the mass of an atom and the sum of the masses of its protons, neutrons, and electrons is called the mass defect.Binding energies are usually expressed in units of electron volts (e V) or million electron volts (Me V) per atom.

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In 1934 Enrico Fermi proposed a theory that explained the three forms of beta decay.This calculation helps us understand the fascination of nuclear reactions.The energy released when natural gas is burned is about 800 k J/mol.The excess energy associated with this excited state is released when the nucleus emits a photon in the -ray portion of the electromagnetic spectrum.Most of the time, the -ray is emitted within 10Nuclides with atomic numbers of 90 or more undergo a form of radioactive decay known as spontaneous fission in which the parent nucleus splits into a pair of smaller nuclei.

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