7. The net potential energy between two adjacent ions, EN, may be represented as (20 points) EN=rA+rnB Calculate the bonding energy E0 in terms of the parameters A,B, and n using the following procedure: a. Differentiate EN with respect to r, and then set the resulting expression equal to zero, since the curve of EN versus r is a minimum at E0. b. Solve for r in terms of A,B, and n, which yields r0, the equilibrium interionic spacing. c. Determine the expression for E0 by substitution of ro into Equation (I)