Question: what is the ratio of electrostatic and gravitational force between two protons?
Answer: By the way, the mass of the proton is 1.7 x 10-27kg. You should be able to show that the ratio of Felec/Fgrav is about 1.2 x 1036 for protons, regardless of the distance between them. Therefore, the gravitational force is certainly not the force that holds protons together in the nucleus of the atom!