CHEM 101A Lecture Notes - Lecture 4: Ammonia, Periodic Table, Noble Gas

• School: University of Arizona
• Department: Chemistry
• Course: CHEM 101A
• Professor: Laura Van Dorn

Document Summary

Will not be given formula for polyatomic ions on exam. When formal charge is zero there are common bonds- forms one lewis structure. Greater the difference in electronegativity the more ionic it is. Smaller difference in electronegativity the more covalent the bond is. Non-metal atoms get close together valence electrons are attracted to protons of other atom but doesn"t completely transfer. Polar- difference in electronegativity that"s bigger than . 4. Don"t share electrons equally it"s because one is more electronegative than the other. Big drop in electronegativity from period two to period three. Nonpolar- equal sharing between electrons in the bond. More electronegative atom in a bond is going to pull electron density away from atom. Neither are a full anion or cation. (partial negative) delta with positive goes to less electronegative atom. (partial positive) delta with negative foes to more electronegative atom. Present in bond and represented by an arrow going from more positive region to more negative region.