$M_p$ denotes the mass of a proton and $M_n$ that of a neutron. $A$ given nucleus,of binding energy $B$,contains $Z$ protons and $N$ neutrons. The mass $M(N, Z)$ of the nucleus is given by ($c$ is the velocity of light):
- A$M(N, Z) = N M_n + Z M_p - B c^2$
- B$M(N, Z) = N M_n + Z M_p + B c^2$
- C$M(N, Z) = N M_n + Z M_p - B / c^2$
- D$M(N, Z) = N M_n + Z M_p + B / c^2$
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