Table of Contents
Preliminary Information
Review
Bonding Between Atoms
Ionic Bonding
Covalent Bonding
Metallic Bonding
Wrap-Up
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Lesson 7
CHEMICAL BONDING
Ionic, Covalent, Metallic
Preview
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.
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 ... |
| bonds? |
| kinds of bonds? |
| numbers of bonds? |
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| 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 ...
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type of bond
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molecules or network
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element or alloy or compound
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| 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 ... |
| lost? |
| gained? |
| shared? |
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E-mail instructor:
Eden Francis
Science Department
19600 South Molalla Avenue
Oregon City, OR 97045
(503) 594-3352
TDD (503) 650-6649 |
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©1998, 2002 Clackamas Community College, Hal Bender
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