CHEM 130 Lecture Notes - Lecture 28: Trigonal Planar Molecular Geometry, Molecular Geometry, Vsepr Theory
Document Summary
Chem 130: general chemistry: macroscopic investigations and reaction principles - The general shape of a molecule, as determined by the relative positions of the atomic nuclei. Predicts the shapes of molecules and ions by assuming that the valence-shell electron pairs are arranged about each atom so that electron pairs are kept as far away from one another as possible, thus minimizing electron-pair repulsion. Two electron pairs in the valence shell of an atom. Electron pairs are 180 from one another. Three electron pairs in the valence shell of an atom. Electron pairs are 120 from one another. Four electron pairs in the valence shell of an atom. Electron pairs are 109. 5 from one another. Molecule axn, where atom a is surrounded by two, three, or four valence-shell electron pairs. Two bonding electron pairs and zero lone electron pairs. Three bonding electron pairs and zero lone electron pairs. Two bonding electron pairs and one lone electron pair.
