CHEM 1410 Chapter Notes - Chapter 9.1-9.2: Lithium Fluoride, Octet Rule, Chemical Formula
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2 Nov 2016
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Atoms bond to lower the potential energy between positive and negative particles. Octet rule when atoms bond, they lose, gain or share electrons to attain a filled outer level of 8. Transfer of electrons from metal to nonmetal ions. Total number of electrons lost by metal atom equals total number of electrons gained by nonmetal atoms. Why ionic compounds form: the importance of lattice energy: electron transfer involves absorption of energy, but energy is released after electron transfer, lattice energy (energy that accompanies 1 mol of ionic solid separating into gaseous ions. Determining lattice energy with a born haber cycle: example. Formation of lithium fluoride: solid lithium is broken down to li gas atoms (metallic bonds are broken so energy absorbed) Ionic solids exist only because the lattice energy far exceeds the total energy needed to form the ions. Increase in charge results in increase of lattice energy.
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