Chemistry 112Chapter 17: 17.3 Bonding in Metals

Metallic Bonds and Metallic PropertiesMetals are made up of closely packed

cations.The valence e- around the nucleus of metal

atoms are often referred to as a sea of e-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.

Crystalline Structure of MetalsMetals 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

AlloysAlloys 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.

For the remainder of class…Correct Section 6.2 as a class.

Go over questions 14 – 22, p. 199.

Finish the guided reading for Chapter Seven.

Begin the review for your test on Tuesday, Oct. 20Chapter 5.1, Chapter 6.1, 6.2, Chapter 7.