Periodic Trends Graphing Activity

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

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

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

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.

Homework STEM Conclusions due tomorrow!!!

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

Periodic Trends Graphing Activity

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

Electronegativity The ability to attract electrons in a chemical bond

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

Part I: Graphing Data .

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

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

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

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

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