The various molecular shapes are tabulated on the next page. Octahedral equatorial positions A 90 E E E E The Molecular Shape is the resulting arrangement of the atoms in the molecule or ion. Total Electron Pairs 2 Arrangement of Electron Pairs Linear 180 Angle Between Electron Pairs E A E E 120 A 3 Trigonal Planar E E E 109 A 4 Tetrahedral E E E axial position E E 90 E A E 120 5 Trigonal Bipyramidal E E E 6 4. Note: Since the regions of density are negatively charged (and therefore repel each other), they will adopt a geometry in which they are located as far apart as possible.

Arrange the regions of electron density in one of the five arrangements shown below. Count up the total number of regions of electron density surrounding the central atom (this includes both bonding and nonbonding pairs of electrons).

Draw a correct Lewis Structure for the molecule or ion. To use VSEPR theory, follow the steps outlined below: 1. VSEPR theory (Valence Shell Electron Pair Repulsion ) must be used to predict the shape of a molecule or ion.

Note that the Lewis Structure does not give information on the shape of the molecule or ion. Preview text Predicting Molecular Shape and Bond Angles The Lewis Structure of a molecule or ion shows only the placement of valence electrons.

Vsepr shapes and polarity