Why Does Iron Have the Highest Average Binding Energy?

thephy
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Why is the average binding energy of iron is biggest?
Are there some theories about it?
 
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Weizsacker semi-empirical mass formula.

http://www2.sjsu.edu/faculty/watkins/semiempirical.htm
 
Summary: smaller nuclei have relatively more nucleons on the surface (these are not bound by neighbours on all sides), and larger nuclei have a stronger Coulomb repulsion. There has to be a maximum somewhere, and this happens to be at iron.
 
Thank you.
 

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