1. Periodic Trends Graphing Activity

2. Evaluation/ Assessment
Objective
Today I will be able to:
Predict and compare the relative radii for different elements
Analyze the trends of ionization energy, electronegativity and atomic radius by completing a graphing activity.
Evaluation/ Assessment
Informal assessment : Listening to group interactions and discussions as they complete the analyzing the periodic trends graphing activity
Formal Assessment : Analyzing student responses to the exit ticket and graphs

3. Lesson Sequence Warm – Up
Explain: discuss the definitions of the three periodic trends of ionization energy, electronegativity and atomic radius
Explore: graphing the data of periodic trends
Informal assessment listening to student ideas about trends as they graph data
Elaborate: identify the trends in noble gases and across periods
Informal assessment as students predict trends
Evaluate: Exit ticket

4. Warm - Up
Make a prediction. Of the element pairs, which element do you think will have a larger radius and why. a) C or N b) Cl or F

5. Objective Today I will be able to:
Predict and compare the relative radii for different elements
Analyze the trends of ionization energy, electronegativity and atomic radius by completing a graphing activity.

6. Homework
STEM Conclusions due tomorrow!!!

7. Agenda Warm – Up Periodic Trends Graphing Activity Exit ticket
Part 1 : Graph
Part 2: Analyze
Part 3: Summarize
Exit ticket

8. Periodic Trends Graphing Activity

9. Atomic Radius
Distance from the center of an atom to the outermost edge of the electron cloud

10. Electronegativity
The ability to attract electrons in a chemical bond

11. Ionization Energy Energy needed to remove an electron from an atom
High ionization energy means atoms hold their electrons very tightly

12. Part I: Graphing Data .

13. Graphing Directions You will work in a group of 3.
Each person in the group is responsible for graphing one trend (Atomic Radius, Electronegativity or Ionization Energy)
You will share the data analysis with the members of your group
You have 15 minutes to complete the activity

14. Part II: Analyzing the Data
Follow the directions to complete part 2 for each graph.

15. Analyzing the Trend down a Family
Procedures:
Begin with your atomic radius graph
Connect all of the points for the noble gases to form a line
For the electronegativity graph connect the points for the halogens
Label this line on your graph
Q: What does this line tell you about the atomic radius across the periodic table?
Repeat this process for ionization energy and electronegativity

16. Part III: Trends Summary
Complete the trends summary worksheet on the back of your data sheet. Share the graphs for each trend with your group to predict how the trend changes across a period and down a family

17. Exit Ticket Review your warm up.
Were your predictions correct? Why or why not.
Why does the atomic radius follow the trend?
Hint: think about what is happening on the nuclear level