1. Electrons Exam Corrections Periodicity Practice
Periodic Trends Activity 3
Electrons Exam Corrections Periodicity Practice

2. Common Core Connection
Objectives
Today I will be able to:
Explain why I got multiple choice questions wrong on the electrons exam
Analyze how the trends of atomic radius, ionization energy and electronegativity change across a period and down a family
Compare the atomic radius, ionization energy and electronegativity of 2 or more elements
Informal assessment: monitoring student questions and interactions as we complete the practice and exam corrections
Formal assessment: analyzing the students interpretations of the trends, practice and exit ticket
Common Core Connection
Model with mathematics
Look for and express regularity in repeated reasoning

3. Lesson Sequence Evaluate: Warm – Up
Explain: Electrons Exam Corrections
Elaborate: Periodicity Practice Worksheet
Elaborate: Applying the trends worksheet
Evaluate: Exit Ticket

4. Warm - Up
How does the atomic radius change across a period and down a family?
How does electronegativity/ionization energy change across a period and down a family?

5. Objective Today I will be able to:
Explain why I got multiple choice questions wrong on the electrons exam
Analyze how the trends of atomic radius, ionization energy and electronegativity change across a period and down a family
Compare the atomic radius, ionization energy and electronegativity of 2 or more elements

6. Homework Finish Analyzing the Trends Worksheet
Study for the Multiple Choice Re-quiz at the beginning of next class

7. Agenda Warm-Up Electrons Exam Corrections Periodicity Practice
Analyzing the trends Worksheet
Exit Ticket

8. Electrons Exam Corrections
Complete the corrections at your desk. Ms. Ose will explain the requirements for the re-quiz next class
Electrons Exam Corrections

9. Why do the Trends Occur?

10. Atomic Radius… Decreases across a period Why? Increases down a family
More protons in the nucleus, pulling the electron cloud closer to the nucleus
Increases down a family
More energy levels for the electrons to fill

11. Atomic Radius

12. Ionization Energy Increases across a period Why?
A greater number of valence electrons makes it more difficult to remove an electron
Decreases down a family
The electrons are farther away from the nucleus. They are less attracted to the atom making them easier to remove

13. Electronegativity Increases across a period Why?
Atoms are closer to reaching stability so they want to attract electrons
Decreases down a family
The electrons are farther away from the nucleus in higher energy levels. They are not attracted to the nucleus as easily

14. Electronegativity

15. Periodicity Practice Worksheet
Complete the worksheet using your notes. Ask Ms. Ose for help if you have questions we will review selected problems.
Periodicity Practice Worksheet

16. Analyzing the Trends Worksheet
Complete the analyzing the trends worksheet. If you do not finish in class, it will become homework. Be sure to respond to all parts of the question
Analyzing the Trends Worksheet

17. Exit Ticket For the following set of elements: Ba Mg O
Circle the element that has the smallest atomic radius
Underline the element with the smallest ionization energy
Box the element with the greatest electronegativity value