CHEM101 Lecture Notes - Lecture 1: Bipyramid, Molecular Geometry, Square Pyramid

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Camille Bowen-Forbes

Document Summary

Polyatomic molecule: has at least one central atom central atom: an atom that is bonded to two or more atoms note that different central atoms in the same molecule may have different geometries. Vsepr: valence-shell electron pair repulsions: valence electrons are present either as bonded electrons localized between atoms or as lone pair (or pairs) around an atom. Single, double and triple bonds all count as one effective pair: lone pair electrons and bonded electrons try to minimize like-charge repulsions by arranging themselves as far apart as possible. Lone pairs are less constricted and therefor we must count each one separately as their contributions to the repulsions. Geometries of these atoms are considered ideal geometries and can be easily determined from the number of effective pairs around that atom. A = central atom // e = lone pairs // x = bonded atoms. Now must use dashes or wedges to convey the 3d shape.