1. Notes:
The Periodic Table

2. Notes: The Periodic Table
The periodic table is set up in order to predict properties of the elements and to place new elements easily.
The table is organized by properties.
What determines the chemical properties of an atom?
Valence Electrons

3. Groups or Families: VERTICAL COLUMNS
Same number of valence electrons
Determines chemical properties.
There are 18 groups.

4. Groups or Families: VERTICAL COLUMNS
Group or Family # 18
- with exception of Helium, all elements has 8 valence electrons

5. Periods: ROWS Same number of energy levels
Period # is same as # of energy levels.
There are 7 periods.

6. Periods: ROWS
Period # 2
- Has 2 rings Li Be 3 4

7. Increase, Decrease, Remain the Same?