Answer:
To calculate the mass defect of a 129Te atom, we need to first determine its theoretical mass using the atomic masses of its constituents:
Mass of 129Te atom = 128.906594 amu
Mass of 52 protons = 52 x 1.007825 amu = 52.4143 amu
Mass of 77 neutrons = 77 x 1.008665 amu = 77.845005 amu
Total mass of 129Te nucleus = 52.4143 amu + 77.845005 amu = 130.259305 amu
The mass defect (Δm) is the difference between the theoretical mass and the actual mass of the atom:
Δm = theoretical mass - actual mass
= 130.259305 amu - 128.906594 amu
= 1.352711 amu
Rounding to 4 significant figures, the mass defect of a 129Te atom is 1.353 amu/atom.
Step-by-step explanation:
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