Born Haber Cycle

Lattice Energy

The energy released during the formation of the crystalline solid from its gaseous ions.
e.g. Na+(g) + Cl-(g) -----> NaCl(s)

Standard Enthalpy of Formation

The calculated amount of energy released when a compound is formed from its constituent elements in their natural phases.
e.g. Na(s) + (1/2)Cl2(g) → NaCl(s)

Sublimation energy

Formation of a gaseous species of a specific substance from the solid species.
e.g. Na(s) -----> Na (g)

Bond Energy

The amount of energy required to break a bond between a diatomic molecule to form a single atom.
e.g. (1/2) Cl2 (g) -->Cl (g)

Ionization Energy

The energy required remove an electron from a neutral gaseous species.
e.g. H(g) -----> H+(g) + e-

Electron Affinity

the energy given off when a neutral atom in the gas phase gains an extra electron to form a negatively charged ion.
(usually a negative number)
e.g. F(g) + e- -----> F-(g)

Born Haber Cycle

Standard Enthalpy of Formation =
(Sublimation energy + bond energy + ionization energy + electron affinity + lattice energy)