posted by Jack .
Determine the amount of energy required (in MeV) to dissociate the following
elements into component parts (protons, neutrons and electrons)
Look up the masses m of the three atomic isotopes and compute m c^2 for each.
Compare them to the sum of the m^c^2 values of the p's, n's and e's.
All three have only one electron.
The difference will be the binding energy.