Question

Why the electrons in nucleus do not get attracted by protons but revolve around nucleus.

Answer 1

They do! Electrons (negatively charged) fall into electron shells around Protons (positively charged) because it results in a less energetic state.
The reason that protons and electrons don’t just “stick together” is that as electrons are attracted closer and closer to protons, they lose potential energy (resulting in a “lower energy state”). But this energy has to go somewhere, and a lot of it is converted to kinetic energy. As the electron falls closer to the nucleus, it loses more and more potential energy and gains kinetic energy, causing it to zip around and never actually hit the nucleus. In VERY simplified terms, it goes into a quantum orbit around the nucleus.

assume same scenario, as we have with our earth & moon/(satellites) , moon is always attracted towards earth, but never reaches it. Moon is always revolving around earth.

same thing happens with electrons and nucleus. electron are always attracted towards nucleus but never reaches it. same way electrons revolve around nucleus.