The following table lists some binding energies and mass defect values. Notice also that we use 1 Da = 931.494 028 (23) MeV/ c. To calculate the binding energy we use the formula Z (m p + m e) + N m n − m nuclide where Z denotes the number of protons in the nuclides and N their number of neutrons. We take m p = 938.272 0813 (58) MeV/ c, m e = 0.510 998 9461 (30) MeV/ c and m n = 939.565 4133 (58) MeV/ c. The letter A denotes the sum of Z and N (number of nucleons in the nuclide). If we assume the reference nucleon has the mass of a neutron (so that all "total" binding energies calculated are maximal) we could define the total binding energy as the difference from the mass of the nucleus, and the mass of a collection of A free neutrons. In other words, it would be (Z + N) m n − m nuclide. The " total binding energy per nucleon" would be this value divided by A.