Why does the neutron-to-proton ratio for stable nuclides generally increase (i e., becomes greater than one) as the number of nucleons increases?

The stable nuclides of elements containing a small number of nucleons generally have neutron-to-proton that are very close to one.

1 Answer
Aug 8, 2018

As there are more protons the repulsive forces between the protons increase which requires more neutral neutrons to hold the atoms together.