Calculate (a) the electric potential established by the nucleus of a hydrogen atom at the mean distance of the circulating electron , (b) the electric potential energy of the atom when the electron is at this radius, and ( c) the kinetic energy of the electron, assuming it to be moving in a circular orbit of this radius centered on the nucleus. (d) how much energy is required to ionize the hydrogen atom? express all energies in electron volts. ( e = 1.60217657 × 10-19 coulombs). note that the answer to (d) is very important and a good number to remember. it sets the scale of the energy of all chemical interactions. chemistry is just energy changes due to rearrangements of charges with a bit of quantum mechanics thrown in!