Ionic Bonding and Lattice Energy
The electron transfer process is an endothermic process, but ionic compound
formation is an exothermic process.
Li(g) Li+ + e- IE1 = 520 kJ
F(g) + e- F-(g) EA = -328 kJ
Li(g) + F(g) Li+(g) + F-(g) IE1 + EA = 192 kJ
But ²Hfo for solid LiF = -617 kJ/mol!
Li+(g) + F-(g) LiF(g) ²Ho = -755 kJ
(an exothermic process due to the attraction of
oppositely charged ions)
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