1. The Periodic Table - Group or Family goes top to bottom (vertical)
- Period goes left to right (horizontal)

2. The Periodic Table
- Most periodic tables have a heavy stepped line running from boron to astatine.
- Elements to the RIGHT of line are NONMETALS.
Elements to the LEFT of line are METALS.
(EXCEPT HYDROGEN!!!)
- Elements to the immediate right and left of this line, except aluminum, are semimetals and have properties that are like both metals and nonmetals.

3. The Periodic Table Some groups/families are given names:
Alkali Metals - Group 1
Ex. sodium and potassium
NOTE!!!
Hydrogen is not a metal!!!
Alkaline Earth Metals - Group 2
Ex. magnesium and calcium

4. The Periodic Table Transition Metals - Groups 3 to 12
Ex. common metals, such as iron, copper, gold, mercury, silver, and zinc.
Halogens – Group 17
Ex. Fluorine and Chlorine

5. The Periodic Table Noble Gases – Group 18 Ex. Helium and Neon
NOTE!!! ALL THESE GROUPS HAVE SIMILAR CHEMICAL PROPERTIES!!!

6. The Periodic Table Alkali Metals Halogens Alkaline Earth Metals
Noble Gases
Transition Metals

7. The Periodic Table
- Atomic weight increases from left to right and top to bottom due to the increase in the number of protons and neutrons

8. The Periodic Table
- Atomic size/radius decreases from left to right due to the increase in protons in nucleus (positive charge) and the fact that electrons are pulled inward –Atomic size/radius increases from top to bottom due to more shells