Mass Defects is the difference between masses of isotopes and its masses number.
Lets calculate the mass defects of tritium, H-3 which has a mass of 3.016049 u.
It requires 2 neutrons and one proton.
Mass of one proton = 1.007825 u
Mass
of two neutron = 2(1.008665) u
Sum of proton and neutron = 3.025155 u
So the mass defect = 3.016649 u − 3.02515 u = −0.009106 u
Note: the singe plus or minus doesn't matter it just tells this mass has been lost.
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