• 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

• 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
– Informal assessment as students answer questions
– Formal assessment collecting responses
• Evaluate: Exit ticket
– Formal assessment

• 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

• 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.

• 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)

• 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

Volunteers will place answers on the board and discuss correct vs. incorrect answers

• 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

1. Magnesium (Mg)
2. Fluorine (F)
3. Rubidium (Rb)
4. Krypton (Kr)
5. Sulfur (S)
6. Antimony (Sb)
7. Germanium (Ge)

• 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

• Law of Octaves - states that any given element will exhibit analogous behavior to the eighth element following it in the periodic table

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

• 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

• 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

• 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

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

• 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