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Sagot :
The mass defect is 0.585942 amu.
Calculation
the provided element is [tex]_{33} ^{65} As[/tex]
atomic number of As = 33
so no of protons = 33
mass number = Number of protons + Number of neutrons
so, no. of neutrons= 65 - 33 = 32
mass of 1 neutron = 1.008665amu
mass of 1 atom = 1.007825 amu= mass of proton
calculated mass = Number of protons*Mass of proton + Number of neutrons*Mass of neutron
= 33 x 1.007825 + 32 x 1.008665
=33.258225 + 32.27728
=65.535505 amu
Given mass = 64.949563 amu
Mass defect = 65.535505 - 64.949563
= 0.585942 amu
Concept of Mass Defect.
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.
A key characteristic of a nucleus is the nuclear mass defect, which has a set value equal to a specific amount of binding energy for that nucleus.
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