Chapter 20, Problem 51E

Interpretation Introduction

Interpretation: The Lewis structures, hybridization and the molecular structures of ${\text{NH}}_{\text{3}},{\text{AsCl}}_{\text{5}}$ and ${\text{PF}}_{\text{6}}{}^{-}$ are to be stated. The reason of non-existence of ${\text{NF}}_5$ and ${\text{NCl}}_{\text{6}}{}^{-}$ is to be stated.

Concept introduction: The following steps are to be followed to determine the molecular structure of a given compound,

• The central atom is identified.

• Its valence electrons are determined.

• The value $1{\text{e}}^{-}$ is added to the total number of valence electrons for each monovalent atom present.

• The total number obtained is divided by $2$ to find the number of electron pairs.

• This further gives the hybridization of the given compound.

To determine: The Lewis structure, hybridization and the molecular structure of ${\text{NH}}_{\text{3}},{\text{AsCl}}_{\text{5}}$ and ${\text{PF}}_{\text{6}}{}^{-}$; the reason of non-existence of ${\text{NF}}_5$ and ${\text{NCl}}_{\text{6}}{}^{-}$.