1. Periodic Trends Lab

2. Drill

3. Objectives
Use a model to describe the trends in several physical properties of the elements
Relate those trends to the electron configuration of the elements

4. Agenda Drill Valence Electrons Periodic Trends Lab
Periodic Trends Practice
Electron Configuration Quiz on Tuesday
Review Sheets

5. Valence Electrons Electrons in the outer shell of an atom
They are the ones involved in forming bonds to adjacent aotoms

6. Periodic Trends Lab
You will conduct an activity to determine different trends in the periodic table
There are 3 trends we are going to be looking at:
Atomic Radius
Ionization Energy
Electronegativity

7. Atomic Radius
The distance from the nucleus to the outer electrons

8. Ionization Energy
The amount of energy required to remove the outermost electron of an atom of an element

9. Electronegativity
The tendency for an atom to attract a pair of bonding electrons when it is combined with another atom in a chemical bond

10. Logistics Get into groups (I will tell you how many)
Pair off within those groups
Each pair will look at a different trend

11. Procedure Take a well plate and label it with your names and period
Cut the straws to scale
Property
Conversion Factor
Example
(For Hydrogen)
Atomic radius
1 cm =30 pm
32 pm x 1cm = cm ( 1.1 cm)
30 pm
Ionization Energy
1 cm = 400 kJ
1312 kJ x 1cm = 3.28 cm ( 3.3 cm)
400 kJ
Electronegativity
1 cm= 0.8 unit
2.2 units x 1cm = 2.75 cm ( 2.8 cm )
0.8 unit

12. Use the diagram of the well plate to plan the placement of the elements
Select colored straws to represent each property
Complete the conversion to determine how long the straws should be
Measure and cut the straw into the appropriate length
Place each piece into the appropriate well of the microplates

13. When you are done… Complete the analysis questions
Complete the periodic trends practice
This will become HW if you are not done

14. HW Study for Electron Configuration Quiz on Tuesday
Finish Periodic Trends Practice