PLEASE ONLY ANSWER THE RED UNDERLINED AREA. THIS ANSWER MUST HAVE A GRAPH

Consider ionic bonding in CsCl (is it ionic?!) The potential energy E per Cs+Clpair within the CsCl crystal depends on the interionic separation r in the same fashion as in the NaCl crystal, E(r)=40re2M+rmB, (r0) of the ions in the crystal and the ionic bonding energy, that is, the ionic cohesive energy; and compare the latter value to the experimental value of 657kJ/mol. Finally, superimpose on a single plot Enet,Eattrart, and Erepulse as functions of r to up to 2.0nm. Consider ionic bonding in CsCl (is it ionic?!) The potential energy E per Cs+Clpair within the CsCl crystal depends on the interionic separation r in the same fashion as in the NaCl crystal, E(r)=40re2M+rmB, (r0) of the ions in the crystal and the ionic bonding energy, that is, the ionic cohesive energy; and compare the latter value to the experimental value of 657kJ/mol. Finally, superimpose on a single plot Enet,Eattrart, and Erepulse as functions of r to up to 2.0nm