Throughout this series we’ve mostly talked about pairs of electrons, but electrons don’t always have a buddy. An atom or group of atoms with a single unpaired electron is called a radical. In this episode of Crash Course Organic Chemistry, we’ll learn all about radicals including the three key steps in a radical reaction and Hammond’s Postulate, an important tool to help us understand these reactions. We’ll also see ways radicals can react with alkanes, alkenes, and alkynes.