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The synthesis of a mole of helium releases 3.4 million times as much energy.Since most nuclear reactions are carried out on very small samples of material, the mole is not a reasonable basis of measurement.
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.
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.
Binding energies are usually expressed in units of electron volts (e V) or million electron volts (Me V) per atom.
Binding energies gradually increase with atomic number, although they tend to level off near the end of the periodic table.
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.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.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 excess energy associated with this excited state is released when the nucleus emits a photon in the -ray portion of the electromagnetic spectrum.