Is the net force on atomic/molecular constituents of a solid body zero So my question is this that suppose we consider a solid everyday object, say a  spherical stone. Now, if I consider an atom or a molecule of the stone away from the center of the stone, then I can say that the gravitational force on the atom/molecule is non zero due to the other atoms/molecular constituents of the stone in question. So what force balances this unbalanced gravitational force? 
If it is the electric repulsion due to the other atoms then why does the body not explode outward, for the electric repulsion due to the other atoms is way stronger than the gravitational force? Or am I missing something here? 
Also, does the crystal structure of arrangement of atoms inside the solid play a role in this?
 A: I am not sure if I fully understand your predicament here. Obviously atoms are not flying off of your object, and the object isn't imploding. So its obvious that the net forces on all parts of the object must cancel. So if you have (probably negligible) amounts of gravitational forces acting between parts of the object, and you have electric interactions acting on parts of the object, you know that these forces must cancel out as a whole. It doesn't matter how strong any single interaction could be. Forces are vector quantities, and these vectors cancel out.
Although we are getting dangerously close to getting into the realm of thinking of individual particles, QM, etc. here. I suppose if you did zoom in far enough you would find that certain parts of your object do experience net forces. But on average these will cancel out, and certainly these forces do not manifest themselves macroscopically. 
A: The Atoms do feel Electrostatic repulsions, so can't be compressed more than a certain extent (except the case when black holes forms). Pauli's exclusion principle, a QM-thing, is also a factor here. This is the reason atoms don't collapse under their own attractive forces, and also the reason that you are able to touch things (otherwise your atoms would pass through anything you try to touch).
But when separated apart to some distance, the Electrostatic repulsions get reduced, and the attractive forces dominate. And these attractive forces are not only gravitational, but various other types of attractions called Van der waal Forces, (or Electrostatic only, in case of salts, or Covalent bonds, if the object is a network solid like diamond).
And when an atom gets in stable equilibrium with these forces, then only it's in rest. For an everyday object, if it is in rest then there may be some net forces on some of its parts but on whole they cancel out so that the centre of mass remains at rest.
Thus, it neither explodes, nor collapse.
