In the PIXEL (“pixel”) formulation, this quantity is calculated using an algorithm that represents molecules as small-volume blocks and accounts for dispersion interactions. A value of either 5, 7, 9, 10, or 12 is assigned to the exponent of the repulsive term of an equation estimating this quantity partly named for Alfred Landé (“lawn-DAY”). Thermodynamic radii and this quantity can be determined using Kapustinskii’s (“ka-pus-TIN-skeez”) equation. Deviations in this quantity due to geometry effects are reflected using (*) Madelung constants. In one method, this quantity (10[1])is indirectly measured by summing and subtracting five different standard enthalpies. The Born-Haber cycle is used to (10[1])theoretically obtain this quantity, which is high in salts with high melting points. For 10 points, name this quantity, the amount of energy required to dissociate a crystal solid into gaseous ion components. ■END■