1. The distance between the electron and proton in a hydrogen atom is 5.3 x10^-11m. Find the speed of the electron as it orbits the proton. 2. I know how to work this thing out, I'm just having trouble getting started, my free body diagram for the electron (assuming the electron is on the right of the proton) shows a gravitational force going down and an electromagnetic force going left towards the proton. What am I missing?