01:160:162 Lecture Notes - Lecture 24: Unified Atomic Mass Unit, Sun-1, Plutonium

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2 Nov 2016
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Consider process of forming a c-12 atom from protons, neutrons, electrons: 6 c : 12. 00000 amu (exactly 12) or 12. 0000 g mol. Masses of individual particles: proton 1. 00727 amu or g mol neutron 1. 00866 amu or g electron 0. 00055 amu or mol g mol. 6p + 6n + 6e = 12. 0989 amu or g mol. Loss of mass = 0. 0989 amu or g mol. How can mass be lost? energy of the nucleus. E corresponds to energy released in forming the nucleus from its particles. This is the binding m is the loss of mass in the process. Our textbook calculates binding energy per nucleus rather than per mole, using the conversion factor of 6. 022 x 1026 amu per kg. for the binding energy of carbon-12: 26 amu x (2. 998 x 108)2 = 1. 48 x 10-11 j. To compare the binding energy of different nuclei, we calculate binding energy nucleon.

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