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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.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 product of this reaction can be predicted, once again, by assuming that mass and charge are conserved. They rapidly lose their kinetic energy as they pass through matter.

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Electron emission therefore leads to an increase in the atomic number of the nucleus.A more useful quantity is obtained by dividing the binding energy for a nuclide by the total number of protons and neutrons it contains.This quantity is known as the binding energy per nucleon.The mass defect is therefore also known as the binding energy of the nucleus. It measures the difference between the stability of the products of the reaction and the starting materials.The larger the binding energy, the more stable the nucleus.The solid line represents a neutron to proton ratio of 1:1.

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