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Periodic table molar mass cl24/7/2024 ![]() Mass was no longer considered unchangeable in the closed system. Note that, it was found the rest mass of an atomic nucleus is measurably smaller than the sum of the rest masses of its constituent protons, neutrons and electrons. For 63Cu the atomic mass is less than 63 so this must be the dominant factor. A nucleus with greater binding energy has a lower total energy, and therefore a lower mass according to Einstein’s mass-energy equivalence relation E = mc 2.
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