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Electrons and protons have unlike charges.so they attract each other.Then what keeps an electron revolving around nucleus instead of getting attracted to protons?
The force that binds electrons to their nucleus is the electro magnetic force (EMF). The protons in each nucleus emits a positive charge that attracts the negative charges of the surrounding electrons. There is one proton charge per electron charge in a neutral atom (i.e., one that is no an ion). The result of the P protons equalling E electrons is that the atom has a zero net charge.

That EM force is stronger in closer to the nucleus where the protons lie. This stronger EMF pulling the electrons toward the core requires a stronger total energy from the electrons to balance out that stronger pull and keep the orbitals outside the nucleus. If the total electron energy becomes less than that of the EMF pull (e.g., through sloughing a photon), it will seek a most likely probability orbital farther out away from the core where the EMF is also weaker.


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