Why are the theoretical and Born Haber lattice enthalpies different?

The theoretical Born Haber enthalpy assumes a perfect ionic model where the attraction between the ions is purely electrostatic and the ions are purely spherical. The Born Haber lattice enthalpy is the real experimental value. 

AV

Related Chemistry A Level answers

All answers ▸

What is the position of chemical equilibrium and how can it change? (A-Level/high GCSE)


How can crude oil be used as a source of hydrocarbons?


How does a change in temperature affect the Kc value when the forward reaction is exothermic?


Why is the first ionisation energy of barium larger than the first ionsiation energy of caesium?