1. Chapter 4.3 Trends in the Periodic Table

2. Objective 1: Describe periodic trends in ionization energy, atomic radius, electronegativity, and ionic size; and relate and relate them to atomic structures of the elements. Trend : predictable change in a particular direction Trends in reactivitydown a group of Alkali Metals

7. Formed by gain of one or more electronsIonic Radii

8. Valence Electrons Defined as the electrons available to be lost, gained, or shared in the formation of chemical compounds Valence electron Sodium atom Chlorine atom

10. Tend to increase across a period

11. Group trends

12. Tend to decrease down a group