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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.

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Nuclei can also decay by capturing one of the electrons that surround the nucleus.A graph of the number of neutrons versus the number of protons for all stable naturally occurring nuclei.Nuclei that lie to the right of this band of stability are neutron poor; nuclei to the left of the band are neutron-rich.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.

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