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If mp = mass of a portion , mn = mass o...

If `m_p` = mass of a portion , `m_n` = mass of a neutron 'M' = Mass of the nucleus with proton number 'Z' and nucleon number A, then the mass defect,`Delta m` is given by

A

`Deltam = (Zm_p + (A-Z)m_n) - M`

B

`Deltam = (Zm_p +M+ (A-Z)m_n) `

C

`Deltam = m_p +ZM+ (A-Z)m_n`

D

`Deltam = Zm_p -(A-Z)m_n + M`

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