The net potential energy between two adjacent ions, E_N, may be represented by the sum of Equations 2.8 and 2.9; that is,

Calculate the bonding energy E₀ in terms of the parameters A, B, and n using the following procedure:

(a). Differentiate E_N with respect to r, and then set the resulting expression equal to zero, since the curve of E_N 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 r₀ into Equation 2.11.

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