CHEM 1F92 Chapter Notes - Chapter 9: Lewis Structure, Lattice Energy, Ionic Compound
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Consequently, the f atom, which just gained the electron (in 2p orbital), forms f-. In ionic compounds involving oxygen, the o2 splits into individual o atoms and then gains electrons to form anions: two li atom loses an electron from its 2s orbital to the 2p orbital of a single o atom. This forms 2 li + and 1 o2-. Since one ion is (+) and the other one is (-), e < 0 and the formation of the bond between 2 ions is an exothermic process. Haber cycle for the formation of lif is shown in the ppt slide. Sublimation is the conversion of a solid to a gas (endothermic process). Dissociation is the splitting of f2 (g) into f (g) (endothermic process). Since only mol of f2 are converted to f, the value is 0. 5(150. 6 kj) = 75. 3 kj. The ionization of li to li+ requires energy and is endothermic. The electron affinity of f is 328 kj.
