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Chemistry

Chemistry. 7.3. 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.

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Chemistry

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  1. Chemistry

  2. 7.3 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.

  3. 7.3 Metallic Bonds and Metallic Properties • Metals are ductile—that is, they can be drawn into wires.

  4. 7.3 Metallic Bonds and Metallic Properties • A force can change the shape of a metal. A force can shatter an ionic crystal.

  5. 7.3 Crystalline Structure of Metals • These tomatoes have a closed-packed arrangement. Similar arrangements can be found in the crystalline structure of metals.

  6. 7.3 Crystalline Structure of Metals • Metal atoms are arranged in very compact and orderly patterns.

  7. 7.3 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.

  8. 7.3 Alloys • Bicycle frames are often made of titanium alloys that contain aluminum and vanadium.

  9. 7.3 Alloys • The most important alloys today are steels. Steels have a wide range of useful properties, such as corrosion resistance, ductility, hardness, and toughness.

  10. 7.3 Section Quiz. • 7.3.

  11. 7.3 Section Quiz. • 1. The valence electrons of metals can be modeled as • a body-centered cube. • octets of electrons. • a rigid array of electrons. • a sea of electrons.

  12. 7.3 Section Quiz. • 2. In most metals, the atoms are • free to move from one part of the metal to another. • arranged in a compact and orderly pattern. • placed at irregular locations. • randomly distributed.

  13. 7.3 Section Quiz. • 3. Alloys are important because they • are pure substances. • are the ores from which metals can be refined. • can have properties superior to those of their components. • are produced by the combustion of metals.

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

  15. END OF SHOW

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