I posted this earlier and no one responded so I am going to try again.
I have to Distinguish between atomic physics and nuclear physics, so here is what i have.
which deals with the atom as a system of electron(s) and a nucleus and nuclear phys
2 answers
http://en.wikipedia.org/wiki/Atomic_physics See the second paragraph.
http://en.wikipedia.org/wiki/Atomic_physics
http://en.wikipedia.org/wiki/Nuclear_physics
http://en.wikipedia.org/wiki/Nuclear_physics