The mass defect of nuclear reaction : 4Be10→5B10+e−is:
A
Δm=At. mass of 4Be10−At.mass of 5B10
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B
Δm=At. mass of 4Be10−At.mass of 5B10−mass of one electron
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C
Δm=At. mass of 4Be10−At.mass of 5B10+mass of one electron
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D
Δm=At. mass of 4Be10−At.mass of 5B10+mass of two electron
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Solution
The correct option is AΔm=At. mass of 4Be10−At.mass of 5B10 The electron has negligible mass. Hence, the mass defect for the reaction is equal to the difference in the atomic mass of 4Be10− and the atomic mass of 5B10.