7.3 Bonding in Metals > 1 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Chapter 7 Ionic and Metallic Bonding 7.1 Ions 7.2 Ionic Bonds and Ionic Compounds 7.3 Bonding in Metals

8.1 Molecular Compounds > 2 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.. Do Now Write the formula of the ionic compound formed when the following elements combine: a)Sodium and Chlorine b)Lithium and Oxygen c)Magnesium and Fluorine d)Calcium and Sulfur e)Potassium and Nitrogen

7.3 Bonding in Metals > 3 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Metallic Bonds and Metallic Properties The valence electrons of atoms in a pure metal 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.

7.3 Bonding in Metals > 4 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Metallic Bonds and Metallic Properties Metallic bonds are the forces of attraction between the free-floating valence electrons and the positively charged metal ions. These bonds hold metals together.

7.3 Bonding in Metals > 5 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Metallic Bonds and Metallic Properties Properties of Metals Conductors of electric current electrons can flow freely in the metal. Ductile: can be drawn into wires Malleable: can be hammered or pressed When subjected to pressure, cations slide past one another

7.3 Bonding in Metals > 6 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.Alloys Alloys Mixtures of two or more elements, at least one of which is a metal. Brass is an alloy of copper and zinc. Properties are often superior to those of their component elements

7.3 Bonding in Metals > 7 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.Alloys The most important alloys today are steels. The principal elements in most steels, in addition to iron and carbon, are boron, chromium, manganese, molybdenum, nickel, tungsten, and vanadium. Steels have a wide range of useful properties, such as corrosion resistance, ductility, hardness, and toughness. Stainless Steel 80.6% Fe 18.0% Cr 0.4% C 1.0% Ni

7.3 Bonding in Metals > 8 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

7.3 Bonding in Metals > 9 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. END OF 7.3