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Chemistry 112

Chemistry 112. Chapter Seven: Bonding in Metals. Metallic Bonds and Metallic Properties. Metals are made up of closely packed cations The valence e- around the nucleus of metal atoms are often referred to as a “sea of electrons” They are mobile and can move around freely

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Chemistry 112

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  1. Chemistry 112 Chapter Seven: Bonding in Metals

  2. Metallic Bonds and Metallic Properties • Metals are made up of closely packed cations • The valence e- around the nucleus of metal atoms are often referred to as a “sea of electrons” • They are mobile and can move around freely • Metallic bonds consist of the attraction of the free-moving e- to the positively charged metallic ions • These bonds force the particles together • As a result, they are good conductors of heat and electricity • They are ductile as well as malleable

  3. Crystalline Structure of Metals • Metals that contain only one kind of atom are the simplest of all crystalline structures • They are arranged in a very compact and orderly pattern • Several arrangements are possible • Body-centred, face-centred, and hexagonal close-packed are three examples • Figure 7.14, page 202

  4. Alloys • Alloys are mixtures of two or more elements, at least of which one is a metal • Ex. Brass, pewter, sterling silver • Alloys are considered to be superior products compared to their respective elements • Typically, harder and more durable • The most important commercial alloys we deal with is steel

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