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 (15[1])Landé (-5[1])(“lawn-DAY”). Thermodynamic radii and this quantity can be determined using Kapustinskii’s (“ka-pus-TIN-skeez”) equation. (-5[1])Deviations in this quantity (15[1])due to geometry effects are reflected using (*) Madelung constants. In one method, this quantity is indirectly measured by summing and subtracting five different standard enthalpies. The Born-Haber cycle is often used to 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■ (10[2])