1. Patterns in the Periodic Table
6.4

2. Chemical Families
CHEMICAL FAMILY: a column of elements on the periodic table with similar physical and chemical properties
Each family has it’s own name
Columns are numbered left to right

3. What are the families?
ALKALI METAL: element in group 1 of the periodic table
Shiny, silvery, and soft
Highly reactive, so often combine with other elements and compounds
Examples: Salt (NaCl), baking soda (NaHCO3), potassium (bananas!)

4. What are the families?
ALKALINE EARTH METAL: an element in group 2 of the periodic table
Shiny, silvery, not as soft as group 1
Not as reactive as group 1
Examples: calcium (milk!), fireworks (bright flames)

5. What are the families?
NOBLE GASES: element in group 18 of the periodic table
Colourless, tasteless, odourless
Unreactive
Non-toxic (except for radon)
The diff noble gases glow diff colours when an electrical current passes through them
Examples: Helium (balloons), Neon (signs)

6. What are the families?
HALOGENS: elements in group 17 of the periodic table
Are gases at room temperature and atmospheric pressure
Very reactive, so often form compounds, especially with group 1
Can be poisonous
Examples: Chlorine (pools, gas),
Halogen (lamps)

7. Periodic Trends Elements in the same row also show trends
PERIOD: a row in the periodic table
Reactivity: group 1 more reactive than group 2, group 17 more reactive than group 16
Now let’s look at some elements!

8. Homework Questions Pg. 225 #1, 2, 8, 9, 10
#7 (done as a class), we will colour in periodic tables!