The relationship between charge and mass in particles such as electrons, protons, and neutrons is defined as intrinsic properties, with no direct correlation between the two. Gravitational force is proportional to mass, while electromagnetic force is proportional to charge. Current theories attempting to unify gravity and electromagnetism have not yet succeeded. Notably, neutron stars, composed entirely of neutral particles, still exhibit a significant gravitational field.
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It would be so much simpler if gravity was a small electrostatic correction. However even neutron stars have a gravitational field and they consist of only neutral particles.chrisbaird said:Some people are trying to show that gravity and electromagnetism are different versions of the same thing, but I don't think this has been accomplished yet.