1. Trends in the Periodic Table

2. Groups Alkali metals – group 1 Alkaline Earth Metals – group 2 Transition Metals – groups 3-12 Halogens – group 17 Noble Gases – group 18

3. Alkali Metals Most Reactive elements in periodic table Reactivity increases as you move down the group (Lithium least reactive – Francium most reactive) Only have one valence electron HYDROGEN is not included in this group It is placed here because it only has valence electron as well

4. Alkaline Earth Metals Still very reactive metals but not as reactive as the alkali metals Have 2 valence electrons

5. Transition metals

6. Halogens Most reactive non metals in the periodic table Have 7 valence electrons

7. Noble Gases Have 8 valence electrons Except for Helium which only has 2 Helium is still a noble gas because it has a full valence shell Considered non reactive