calculate the mass defect of Helium `[""._(2)He^(4)]` mass of proton `=1.007276 u,` Mass of neutron `=1.008665u,` Mass of `""._(2) He^(4)= 1.001506 u,
calculate the mass defect of Helium `[""._(2)He^(4)]`
mass of proton `=1.007276 u,`
Mass of neutron `=1.008665u,`
Mass of `""._(2) He^(4)= 1.001506 u,`
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Mass defect =Mass of nucleons -Mass of nucleus
[here ,A(Mass number )=4
Z(atomic number )=2
`implies `Number of neutrons =2
Number of neutrons =a-Z=4-2=2
Mass of protons +Mass Of 2neutrons -Mass of nucleus
`=[2xx1.007276+2xx1.008665-4.001506]=0.030376 u`
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