(a) Schematically plot the curve of net potential energy (En) vs. interatomic separation (r) for two isolated atoms. Indicate on the plot the equilibrium separation ro and the bonding energyEọ.

(b) Schematically plot the curve of net force (FN) vs. interatomic separation (r) for two isolated atoms. Indicate on the plot the equilibrium separation ro. (c) Briefly describe the behaviors of the net potential energy and the net force at the vicinity of equilibrium separation ro, i.e. how the energy and force change with the change of interatomic separation around ro.