The mass defect in amu/atom is 11.928.
The mass defect is the discrepancy between the nucleus of an atom's anticipated mass and its actual mass. This discrepancy is due to the binding energy of a system, which might manifest as excess mass.
The nucleus must be robustly spherical as expected for a doubly magical nucleus because the stripped neutron fell into a distinct orbital shell above the closed inner shells of tin-132 after the researchers examined the energy and angular distribution of the particles.
Mass of atom = 131.917760 amu
Mass of proton = 1.007825 amu
Mass of neutron = 1.008665 amu
Sn atom has 50 protons and 69 neutrons.
Mass defect = Mp + Mn - MA
= 50 × 1.007825 + 69 × 1.008665 - 131.917760
= 50.39125 + 69.597885 - 131.917760
= 11.928 amu/atom
Therefore, the mass defect in amu/atom is 11.928.
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