In the ionic salt KF, the separation distance between ions is about 0.27nm.
(a) Estimate the electrostatic potential energy between the ions assuming them to be point charges (magnitude) 1e),
(b) It is know that F releases 4.07eV of energy when it “grabs” an electron, and 4.34eC is required to ionize K. Find the binding energy od KF relative to free K and F atoms, neglecting the energy of repulsion.