In a single molecule of kf, the equilibrium internuclear separation is r0 = 2.67 å and the lattice energy (-ei ) is 0.50 ev/molecule smaller than the coulomb attractive energy, because of overlap repulsion. given that the electron affinity of fluorine is 4.07 ev/electron and that the first ionization energy of potassium is 4.34 ev, show that the energy necessary to separate the molecule into neutral atoms is -0.945 ei.