Why Do Nickel and Iron Exhibit the Highest Binding Energy?

[learning_phys]

why is it that nickle and iron have the highest binding energy?

http://upload.wikimedia.org/wikiped...inding_energy_curve_-_common_isotopes.svg.png

 

[Dick]

Several reasons. What two competing forces contribute to nuclear binding energies? Why are neutron rich nuclei unstable?

 

[learning_phys]

i'm not sure. i really do not know much about this, it was more of a general question. though i would love to hear an explanation :) thanks!

 

[Dick]

The simplified story is that the strong nuclear force makes nucleons bind to each other. The more nucleons there are around, the more partners anyone nucleon has available to bind to. That's the reason for the rising binding energy to begin with. It stops growing as the neighborhood of each nucleon becomes full since nuclear binding is short range. The force opposing stability is electrostatic repulsion between the protons. Which just keeps growing as protons are added since it is a long range force. By the time you get up to uranium, the nucleus is just about ready to spontaneously fall apart.

 

[learning_phys]

what about binding energies to their electrons? does a higher nuclear binding energy result in a strong hold in its electrons?

 

[DieCommie]

I think the binding energy is between nuclear particles only and the electron sees only the protons (maybe diminished from screening by inner electrons)