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Lesson 3 was concerned primarily with the various types of atomic bonding and how bonding is determined by the electron structures of the individual atoms. In this lesson, the structure of materials was discussed beginning with how metal atoms arrange to form solids. Within this framework, concepts of single crystal (highly ordered), polycrystalline (many unaligned regions of crystalline material), and non-crystalline (little to no order, also known as amorphous) materials were introduced. For crystalline solids, the notion of crystal structure was presented, and specified in terms of a unit cell.
Reminder - Complete all of the Lesson 5 tasks!
You have reached the end of Lesson 5! Double-check the to-do list on the Overview page to make sure you have completed all of the activities listed there before you begin Lesson 6.