It can be found exactly by adding together energies of sublimation, bond energies, electron affinities, and ionization energies by using the approach of a BornÂ–Haber cycle.
This quantity can be approximated by multiplying a theoretical guess by one minus the quantity rho over rÂ­zero, where rho is a distanceÂ­scale related to the compressibility of the material. In another formalism, this value is derived by assuming a twoÂ­term potential with an electrostatic negative 1Â­overÂ­r term plus a repulsive1Â­overÂ­r to the n term. This quantity is proportional to a geometric constant found by summing an alternating series using a method developed by Ewald ("ayÂ­vald"). It can also be found by using an equation with two empiric parameters discovered by (*) Kapustinskii. It can be found exactly by adding together energies of sublimation, bond energies, electron affinities, and ionization energies by using the approach of a BornÂ–Haber cycle. This quantity is proportional to ion charge and inversely proportional to ionic radius; this is why it is higher forMgO than for NaCl. For 10 points, name this quantity equal to the energy released by the formation of a crystal from infinitely separated ions.
This quantity can be approximated by multiplying a theoretical guess by one minus the quantity rho over rÂ­zero, where rho is a distanceÂ­scale related to the compressibility of the material.
lattice  energy  [accept  lattice  enthalpy  or  energy  of  crystallization  or  enthalpy  of  crystallization] 