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Chap8,2 - Chem 200 Dr Saidane Lecture Notes CHAPTER 8 Part...

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Chem. 200 Dr. Saidane Lecture Notes CHAPTER 8, Part 2 Chemical Bonding BONDS ENERGIES of IONIC COMPOUNDS Lattice Energy In order for atoms to produce ionic compounds they need energy to produce cations and anions from their neutral atoms. The ionization energy of the metal must first be supplied, which makes the metal become a cation by losing its valence shell electrons. These electrons will then be transferred to the nonmetal to produce an anion. This process corresponds to the release of energy (electron affinity). In this process the ionization energy is recovered from the electron affinity of the nonmetal atoms as they form anions. The overall absorption of ionization energy and release of electron affinity results in the lowering of energy of the original atoms. The overall lowering of energy is due to the strong attraction between cations and anions that occurs in the solid ionic compound. The energy difference between ions and atoms is called the lattice energy. Lattice energy is the heat released when the solid lattice forms from gaseous ions . The strength of the interaction is measured by the lattice enthalpy. The lattice enthalpy is large for compounds formed from small, highly charged ions.
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