SAM Model:-
Back in 1932 Nobel prizewinners Cockroft and Walton were thinking along similar lines, they said:-
This was at a time when Chadwick had just discovered the neutron and Rutherford considered it to be
a proton containing a bound electron, hence they say " 3 protons and 2 electrons "
I think Jurg would argue that Rutherford was/is right
"Since about six months SO(4) physics just uses electrons and protons to model all mass - including the neutron of course"
Cheers Pete..