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The reaction is usually accompanied by the ejection of one or more neutrons.In 1934 Enrico Fermi proposed a theory that explained the three forms of beta decay.The binding energy per nucleon ranges from about 7.5 to 8.8 Me V for most nuclei, as shown in the figure below.It reaches a maximum, however, at an atomic mass of about 60 amu.Alpha decay is usually restricted to the heavier elements in the periodic table.(Only a handful of nuclides with atomic numbers less than 83 emit an -particle.) The product of -decay is easy to predict if we assume that both mass and charge are conserved in nuclear reactions.Alpha decay of the The sum of the mass numbers of the products (234 4) is equal to the mass number of the parent nuclide (238), and the sum of the charges on the products (90 2) is equal to the charge on the parent nuclide.Nuclei can also decay by capturing one of the electrons that surround the nucleus.
As soon as they come to rest, they combine with an electron to form two -ray photons in a matter-antimatter annihilation reaction.-decay are often obtained in an excited state.
This calculation helps us understand the fascination of nuclear reactions.
The energy released when natural gas is burned is about 800 k J/mol.
It can capture an electron or it can emit a positron.
Electron emission therefore leads to an increase in the atomic number of the nucleus.
The solid line represents a neutron to proton ratio of 1:1.