If m,mn and mp are masses of .Z X^A nucl...

If `m,m_n` and `m_p` are masses of `._Z X^A` nucleus, neutron and proton respectively.

`m=(A-Z)m_n+Zm_p`

`m=(A-Z)m_p+Zm_n`

`m lt (A-Z) m_n+Zm_p`

`m gt (A-Z) m_n+Zm_p`

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