CHEM 130 Lecture 10: chem lect 10
Document Summary
Clicker: rank the following species in order of decreasing ionic radii: k+, se2-, cl-, br : se2 > br-> cl-> k+ Cl-< br: 4 lattice energy, zinc compounds are really strong lattice energy: ionic compounds form solid structuring that maximizes +/- interactions and minimizes +/+ and -/- interactions. Stability of the packing arrangement ( lattice") is called the lattice energy. Larger magnitude more or negative lattice energy- means it is more stable. Clicker: which substance in each of the following groups has the most negative lattice energy: lif, csf, kf, k2o, li2o, na2s. Why? look for: charge on inions and distance between earnest neighbor cation and anion: charges are all the same (+1) so only difference is r > li loses f gains: li+ f- Li is much smaller than cs so r is going to be smaller, making the mag of lattice energy larger (more negative)
