Notes:

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?