Slide 1 of 19 Chemistry. © Copyright Pearson Prentice Hall Slide 2 of 19 Bonding in Metals You have...

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Chemistry

© Copyright Pearson Prentice Hall

Slide 2 of 19

Bonding in Metals

You have probably seen decorative fences, railings, or weathervanes made of a metal called wrought iron. In this section, you will learn how metallic properties derive from the way that metal ions form bonds with one another.

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Bonding in Metals>

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Metallic Bonds and Metallic Properties

Metallic Bonds and Metallic Properties

How can you model the valence electrons of metal atoms?

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Bonding in Metals> Metallic Bonds and Metallic Properties

The valence electrons of metal atoms can be modeled as a sea of electrons.

The valence electrons are mobile and can drift freely from one part of the metal to another.

Metallic bonds consist of the attraction of the free-floating valence electrons for the positively charged metal ions.

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Metals are ductile—that is, they can be drawn into wires.

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A force can change the shape of a metal. A force can shatter an ionic crystal.

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Bonding in Metals> Animation 9

Animation 9 See how metallic bonding explains some physical properties of metals.


Bonding in Metals>

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Crystalline Structure of Metals

Crystalline Structure of Metals

How are metal atoms arranged?

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Bonding in Metals> Crystalline Structure of Metals

These tomatoes have a closed-packed arrangement. Similar arrangements can be found in the crystalline structure of metals.

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Bonding in Metals> Crystalline Structure of Metals

Metal atoms are arranged in very compact and orderly patterns.

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Alloys

Alloys

Why are alloys important?

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Bonding in Metals> Alloys

Alloys are mixtures composed of two or more elements, at least one of which is a metal.

Alloys are important because their properties are often superior to those of their component elements.

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Bicycle frames are often made of titanium alloys that contain aluminum and vanadium.

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The most important alloys today are steels. Steels have a wide range of useful properties, such as corrosion resistance, ductility, hardness, and toughness.

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Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

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1. The valence electrons of metals can be modeled as

a. a body-centered cube.

b. octets of electrons.

c. a rigid array of electrons.

d. a sea of electrons.

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2. In most metals, the atoms are

a. free to move from one part of the metal to another.

b. arranged in a compact and orderly pattern.

c. placed at irregular locations.

d. randomly distributed.

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3. Alloys are important because they

a. are pure substances.

b. are the ores from which metals can be refined.

c. can have properties superior to those of their components.

d. are produced by the combustion of metals.

7.3 Section Quiz.


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Bonding in Metals> Concept Map 7

Concept Map 7 Solve the Concept Map with the help of an interactive guided tutorial.

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