VSEPR Model, electron domains

Introduction to VSEPR Model

"The best arrangement of a given number of electron domainsis the one that minimizes the repulsions among them".

Principles:

Electrons adopt an arrangement in space to minimize e−e repulsion.
When considering the geometry about the central atom, all electrons (bonding and non-bonding pairs) are considered.
When naming the molecular geometry, we focus only onthe positions of the atoms.

According to the VSEPR theory, Geometry of a molecule is determined based on the number of electron domains around the central atom of a molecule, called Electron-Domain Geometry.

Types of Electron Domains

Example SO₂

As shown below, the central atom (S) has three (3) electron domains: (one nonbonding pair, one single bond & one double bond)
SO2

bonding domains,nonbonding electrons,electron domains

Introduction to VSEPR Model

Types of Electron Domains

Example SO2

Example SO₂