1. History of the Periodic Table

2. Evaluation/ Assessment
Objective
Today I will be able to:
Analyze patterns to determine the location of mystery elements on the periodic table.
Explain the history of the periodic table and how it relates to the nature of discovering scientific knowledge.
Evaluation/ Assessment
Informal assessment – Listening to group interactions and discussions as they complete the Mendeleev lab of 1869 activity. Monitoring students responses as they complete the periodic table worksheet.
Formal Assessment – Analyzing student responses to the exit ticket, periodicity practice and periodic table worksheet
Common Core Connection
Build Strong Content Knowledge
Value Evidence
Reason abstractly and quantitatively
Make sense of problem and persevere in solving them
Model with mathematics
Look for and make use of structure
Look for and express regularity in repeated reasoning

3. Lesson Sequence Warm – Up Elaborate: Periodicity Practice Worksheet
Informal assessment as students answer questions
Formal assessment collecting responses
Engage and Explore: The Mendeleev Lab of 1869 activity
Informal assessment – monitoring student responses as they arrange the pattern of the elements
Explain: History of the Periodic Table Notes
Elaborate: Periodic Table Worksheet
Evaluate: Exit ticket
Formal assessment

4. Warm - Up Which element has the larger radius? Explain.
Be or O
Which element has the smaller electronegativity? Explain.
Sr or Ra
Which element has the greater ionization energy? Explain.
S or Cl

5. Objective Today I will be able to:
Analyze patterns to determine the location of mystery elements on the periodic table.
Explain the history of the periodic table and how it relates to the nature of discovering scientific knowledge.

6. Homework Periodic Table Worksheet
Study for Periodic Table Exam on Thursday
Exam Format – 65 Points
24 multiple choice (1 point each)
10 problems identifying trends (radius, ionization energy and electronegativity – 3 points each)
4 short answer questions about history of the periodic table and oxidation numbers 2-3 points each)

7. Agenda Warm – Up Periodic Table Exam Study Guide
Review Periodicity Worksheet
The Mendeleev Lab of 1869
History of the Periodic Table Notes
Periodic Table Worksheet
Exit Ticket

8. Review Periodicity Worksheet
Volunteers will place answers on the board and discuss correct vs. incorrect answers

9. The Mendeleev Lab of 1869 Activity
Each row will work together
Your goal is to construct the periodic table and identify the location of the unknown elements
Lay out the arrangement of the known elements first, leave gaps for the missing elements
Use the properties on the cards to predict the location of the unknown elements on the periodic table
The elements represent the “s” and “p” block only
None of the elements repeat

10. What are the mystery elements?
Magnesium (Mg)
Fluorine (F)
Rubidium (Rb)
Krypton (Kr)
Sulfur (S)
Antimony (Sb)
Germanium (Ge)

11. History of the Periodic Table Notes

12. Johann Dobereiner (1829)
Law of Triads - in triads of elements the middle element has properties that are an average of the other two members when ordered by the atomic weight
Example - halogen triad composed of chlorine, bromine, and iodine

13. John Newlands (1864)
Law of Octaves - states that any given element will exhibit analogous behavior to the eighth element following it in the periodic table

14. Dmitri Mendeleev (1871) Developed the first Periodic Table
He arranged his table so that elements in the same column (groups) have similar properties; increasing atomic mass

15. Dmitri Mendeleev (1871)
Broke the trend of arranging elements solely by their atomic mass
Wanted to keep elements with similar properties in the same columns
Left gaps in his early tables; predicted elements that had not been discovered would fill in those gaps

16. Dmitri Mendeleev (1871)

17. Henry Moseley (1913)
Found a relationship between an element’s X-ray wavelength and it’s atomic number (number of protons)
Periodic Law - when elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic (repeating) pattern
The periodic law is the basis for arranging elements in the periodic table

18. Glenn Seaborg
He reconfigured the periodic table by placing the actinide series below the lanthanide series
Awarded a Nobel Prize in 1951
Element 106, Seaborgium (Sg), is named in his honor

19. Periodic Table Worksheet
Use information from notes and textbooks to complete. Upon completion we will review it as a class.

20. Exit Ticket
Write one question that could be used on the exam about one of the periodic trends. (atomic radius, ionization energy and electronegativity).
Include the answer to the question