CHEM 1061 Chapter Notes - Chapter 9: Bond Order, Ionic Radius, Electronegativity

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2 May 2016
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Bonding lowers the potential energy between positive and negative particles. Between atoms with large differences in their tendencies to gain/lose electrons. Two atoms differ little, or not at all, in their tendencies to gain/lose electrons. Electron pair is typically localized between the two atoms. Element symbol represents the nucleus and inner electrons. Dots around the symbol represent the valence electrons. Metal: the total number of dots is the number of electrons an atom loses to form a cation (mg mg2+) Nonmetal: the number of unpaired dots equals either the number of electrons an atom gains to form an anion (f f--) Lattice energy: the enthalpy change that accompanies the reverse of the previous equation. Measure of the strength of the ionic interactions and influences macroscopic properties. Born-haber cycles shows energy that is required for elements to form ions is supplied by the attraction among the ions in a solid.

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