Strong Chemical Bonds


Table of Contents
Preliminary Information
Bonding Between Atoms
Ionic Bonding
Covalent Bonding
Metallic Bonding

Lesson 7


Ionic, Covalent, Metallic



You have learned a lot about chemistry in the past several lessons, but in some respects we are still at the beginning and still need to deal with simplified versions of the ways that atoms interact with one another. With that in mind, please realize that the statements in this lesson about how atoms bond to one another should be considered guiding principles rather than inviolable rules.

There are many ways in which the atoms that you have been studying in the last few lessons can combine with one another. In this lesson we will limit ourselves to three types of strong chemical bonds - ionic, covalent and metallic - which can be used to describe the bonding in pure substances (compounds and elements) and alloys. Those three types of bonds are represented in the models shown here. Soon you will be able to identify and describe the type of bonding represented in each of these models.

Models of Ionic, Covalent and metallic Bonding

In the next lesson we will take up weak chemical bonding (van der Waals, hydrogen, dipole-dipole and ion-dipole) which occurs primarily between molecules and deals with properties that the strong bonds are not directly responsible for.

Your goal in this lesson should not be limited to learning the right words and descriptions but rather to understand the logic of chemical bonding. What causes the formation of bonds? What causes the formation of different kinds of bonds? What causes one atom to form one bond, another to form two bonds, and yet another to form a dozen bonds?
What causes ...
kinds of bonds?
numbers of bonds?


As noted in the overview objectives for this lesson, you will need to be able to determine what type of bonding will hold certain atoms together. That decision will be based on what types of atoms are involved. You will need to be able to determine whether the atoms bond together to form molecules or a network. That decision also will be based on what types of atoms are involved. You will need to determine whether the atoms bond together to form an element, an alloy or a compound. That decision will also be based on the types of atoms involved. I think you can see that it will be very important to know quite a bit about the nature of the atoms you will be working with.
Need to determine ...
type of bond
molecules or network
element or alloy or compound


You will also need to focus on what happens to the electrons of those atoms. Will they be lost, gained, shared or moved from one place to another. Again, this will depend on the nature of the atoms that are involved and how they interact with one another.
Are electrons ...


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Clackamas Community College E-mail instructor: Eden Francis
Science Department
19600 South Molalla Avenue
Oregon City, OR 97045
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