CHEM 101A Lecture Notes - Lecture 3: Electronegativity, Ionic Radius, Ionic Compound
18 Sep 2016
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Document Summary
Various properties of ionic compounds like melting and boiling point depend on ion charge and ion size. Sodium becomes na+1 because it has one extra electron after noble gas configuration and wants to get rid of it. Elements one electron away from becoming a noble gas. Metal and nonmetal is ion nonmetal and nonmetal give covalent molecule. Covalent molecules have much lower melting and boiling points than ionic compounds. The stronger the electrostatic force among ions the higher the boiling and melting points. Lattice energy- how much energy do you have to put in to separate the ions. Crystalline solids with very high melting and boiling points. Forces between ions of electrostatic forces determined by coulomb"s law. Larger the charge of ions stronger the force between them. Smaller the radius the greater the attraction- smaller the ions the greater the attractive force- charge will dominate- look at charge first. Higher melting & boiling point can be determined by bigger charge.
