Chapter 8.3, Problem 22LC

Interpretation Introduction

Interpretation: The use of VSEPR theory needs to be explained.

Concept Introduction: VSEPR theory stands for valance shell electron pair repulsion theory. It is based on the fact that there is repulsion between valence electrons in all atoms.

Explanation of Solution

VSEPR theory is used to predict the molecular shape with the help of electron pairs around the central atoms of the molecule. It is based on the assumption that the shape of the molecule is such that there is minimum electronic repulsion between the valence shells of an atom.

Thus, scientists use VSEPR theory to explain the geometry and shape of the molecules.

According to VSEPR theory, the following table shows the relation between the total number of bonding and non-bonding pair of electrons and the geometry of a molecule.

Total number of bonding and non-bonding pairs	Electron pair geometry	Shape
		No lone pairs	1	2	3	4
6	Octahedral	Octahedral	Square pyramidal	Square planar	T-shaped	Linear
5	Trigonal pyramidal	Trigonal pyramidal	Sawhorse	T-shared	Linear
4	Tetrahedral	Tetrahedral	Trigonal planar	Bent
3	Trigonal planar	Trigonal planar	Bent
2	Linear	Linear