After this lesson, you should be able to:

• Follow guidelines to draw Lewis and Couper diagrams of simple covalent molecules
• Write the names and formulae of covalent compounds
• Distinguish between non-polar and polar covalent bonds
• Describe, using Lewis diagrams, the formation of ions and ionic bonds and represent cations and anions
• Predict the ions formed by atoms of metals and non-metals using information from the PT
• Name ionic compounds
• Describe the structure of an ionic crystal
• Describe the simple model of metallic bonding in terms of positive ions in a sea of electrons