Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892


Chapter 2.3, Problem 2SB
Textbook Problem

How does a covalent bond form?

Expert Solution
Summary Introduction

To review:

The formation of a covalent bond.


The chemical activity of an atom depends on the electrons present in the outermost shell of the atom. These electrons are called valence electrons. The valence shell is different for different elements and depends on the number of electrons present in its atom. An atom with a complete valence shell is nonreactive and chemically stable. In order to complete their valence shells and attain stability, atoms combine together to form chemical bonds.

Explanation of Solution

A chemical bond is formed by transferring or sharing electrons between the atoms. Atoms with one, two, or three valence electrons tend to donate electrons to complete their valence shell, while those with four electrons prefer to share. Atoms with more than four valence electrons either share their electrons or donate the electrons for attaining stability.

A bond formed by the electron transfer between atoms of two different elements is called the ionic bond as ions are formed in it. A bond formed by the sharing of electrons is called the covalent bond. These atoms may be of the same or different elements. These atoms can neither donate nor lose electrons. Such atoms have four or more electrons in their valence shell. All the valence electrons may or may not be shared between the atoms...

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Chapter 2 Solutions

Biology: The Dynamic Science (MindTap Course List)
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