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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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What general principles determine the molecular structure(shape) of a molecule?

Interpretation Introduction

Interpretation:

The general principles which determine the molecular structure (shape) of a molecule are to be stated.

Concept Introduction:

The geometry of molecule is determined by electron pair present around the central atom. VSEPR theory is an important model that is frequently used in chemistry to decide the shape and geometry of the molecules. VSEPR model is the extension of Lewis model. As the Lewis model is not able to explain the shape of the molecules.

The shape in VSEPR model gives specific angles between the bonds for the corresponding shape and these angles are known as bond angles.

Explanation

The molecular structure (shape) of a molecule is easily predicted on basis of VSEPR theory.

The general principles which determine the molecular structure (shape) of a molecule are shown below.

  • Firstly, the number of valence electrons of all the atoms in the given molecule is calculated by using electronic configurations.
  • The second step involves the formation of Lewis structure. The representation an element along with its valence electrons is referred to as Lewis symbol or Electron Dot Symbol. The Lewis structure exhibits the connection between atoms. Each dot around an atom represents electrons.
  • In the third step, the number of electron pairs is calculated.
  • The formula to calculate the number of electron pairs around central atom in the given compound is,

    No.ofelectronpair=12No.ofvalenceelectronofcentralatom+No

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