1. 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