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1/10/15
1
Slide 1 of 19
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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© Copyright Pearson Prentice Hall
Bonding in Metals >
Slide 3 of 19
Metallic Bonds and Metallic Properties
Metallic Bonds and Metallic Properties
How can you model the valence electrons of metal atoms?
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Slide 4 of 19
© Copyright Pearson Prentice Hall
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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Slide 5 of 19
© Copyright Pearson Prentice Hall
Bonding in Metals > Metallic Bonds and Metallic Properties
Metals are ductile—that is, they can be drawn into wires.
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Slide 6 of 19
© Copyright Pearson Prentice Hall
Bonding in Metals > Metallic Bonds and Metallic Properties
A force can change the shape of a metal. A force can shatter an ionic crystal.
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© Copyright Pearson Prentice Hall
Slide 7 of 19
Bonding in Metals > Animation 9
Animation 9 See how metallic bonding explains some physical properties of metals.
© Copyright Pearson Prentice Hall
Bonding in Metals >
Slide 8 of 19
Crystalline Structure of Metals
Crystalline Structure of Metals
How are metal atoms arranged?
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Slide 9 of 19
© Copyright Pearson Prentice Hall
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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Slide 10 of 19
© Copyright Pearson Prentice Hall
Bonding in Metals > Crystalline Structure of Metals
Metal atoms are arranged in very compact and orderly patterns.
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© Copyright Pearson Prentice Hall
Bonding in Metals >
Slide 11 of 19
Alloys
Alloys
Why are alloys important?
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Slide 12 of 19
© Copyright Pearson Prentice Hall
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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Slide 13 of 19
© Copyright Pearson Prentice Hall
Bonding in Metals > Alloys
Bicycle frames are often made of titanium alloys that contain aluminum and vanadium.
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Slide 14 of 19
© Copyright Pearson Prentice Hall
Bonding in Metals > Alloys
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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