Summarize how the sign of the charge affects the direction of the force (attraction or repulsion) in two complete sentences or more.

A study of structure of atom reveals that there exist fundamental particle namely proton and neutrons in it .

Protons and neutrons lie in the central part of atom .

There is a force present in the nucleus of an atom in orbit and electrons that revolve round the nucleus . These outermost orbitals and the electrons present in them are called valence electrons .