The mass defect of the nuclear reaction `._(5)B^(8) rarr ._(4)Be^(8) + ._(1)e^(0)` is `Delta m`, the wrong expression `"is&

The mass defect of the nuclear reaction `._(5)B^(8) rarr ._(4)Be^(8) + ._(1)e^(0)` is `Delta m`, the wrong expression `"is"//"are"`
A. `Delta m =` atomic mass of `(._(4)Be^(8) - ._(5)B^(8))`
B. `Delta m =` atomic mass of `(._(4)Be^(8) - ._(5)B^(8)) +` mass of one electron
C. `Delta m =` atomic mass of `(._(4)Be^(8) - ._(5)B^(8)) +` mass of one positron
D. `Delta m =` atomic mass of `(._(4)Be^(8) - ._(5)B^(8)) +` mass of two electrons

The mass defect of the nuclear reaction `._(5)B^(8) rarr ._(4)Be^(8) + ._(1)e^(0)` is `Delta m`, the wrong expression `"is"//"are"`

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