1. © Copyright Pearson Prentice Hall Slide 1 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. 7.3

2. Slide 2 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. 7.3

3. Slide 3 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. 7.3

4. Slide 4 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. 7.3

5. © Copyright Pearson Prentice Hall Bonding in Metals > Slide 5 of 19 Crystalline Structure of Metals How are metal atoms arranged? 7.3

6. Slide 6 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. 7.3

7. Slide 7 of 19 © Copyright Pearson Prentice Hall Bonding in Metals > Crystalline Structure of Metals Metal atoms are arranged in very compact and orderly patterns. 7.3

8. © Copyright Pearson Prentice Hall Bonding in Metals > Slide 8 of 19 Alloys Why are alloys important? 7.3

9. Slide 9 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. 7.3

10. Slide 10 of 19 © Copyright Pearson Prentice Hall Bonding in Metals > Alloys Bicycle frames are often made of titanium alloys that contain aluminum and vanadium. 7.3

11. Slide 11 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. 7.3

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