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Sep 21, 2014

SALIENT FEATURES OF VSEPR THEORY

WHAT ARE THE SALIENT FEATURES OF VSEPR THEORY?

Swathi Ambati

Member since Apr 28, 2014

According to the VSEPR theory, every atom in a molecule will adopt geometry such that the repulsion between the valence electrons in the atoms is minimal. And the electron pairs prefer to occupy maximum distance from each other. The VSEPR theory varies for molecules with the presence of lone pairs and multiple bonds around the central atom. On the central atom of a molecule, the repulsion between two lone pairs of electrons is the greatest. The repulsion between a bond pair and another bond pair is the weakest, and that between a lone pair and a bond pair is between these two. Decreasing order of repulsion forces: Lone pair (lp)-lone pair (lp)>lone pair (lp)-bond pair (bp)>bond pair (bp)-bond pair (bp) In case of molecules with lone pairs around the central atom, the geometry of the electron pairs and the shape of the molecule may differ. Types of geometry based VSEPR theory: Based VSEPR theory the geometry of the molecules classified into two types, they are regular geometry and irregular geometry. The molecules in which central atom covalently bonded with similar kind of atoms or there are all bond pairs present around central atom will posses regular geometry. Ex: CH₄, BeCl₂…etc
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