Q:

I have been wondering why only electrons revolve around protons instead of protons other way around. They have electrostatic force and I think mass factor has nothing to do here. Then why?

Electrons do not "revolve around" the nucleus. They have a probability to be found near the nucleus, and they have the property of angular momentum but you really should not imagine it as proper movement... –
Stian Yttervik
Sep 20 at 13:32

A:

NB: I interpreted the question to essentially mean, why do protons rather than electrons reside in nuclei?

Electrons repel each other with a Coulomb force that grows very large when they are close together. Protons also repel each other in the same way, but the difference is that protons are also attracted to each other and to neutrons by the even stronger strong nuclear force (since protons are made up of quarks that feel the strong force), which acts over short range (∼10−15

m) and thus can be bound into dense nuclei.

Electrons are point-like particles and not made up of quarks. They do not interact via the strong nuclear force and cannot be bound into dense nuclei.