Transcript History of the Periodic Table

History of the Periodic Table
• 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
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
– Informal assessment as students answer questions
– Formal assessment collecting responses
• Evaluate: Exit ticket
– Formal assessment
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
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.
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)
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
Review Periodicity Worksheet
Volunteers will place answers on the
board and discuss correct vs.
incorrect answers
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
What are the mystery elements?
1.
2.
3.
4.
5.
6.
7.
Magnesium (Mg)
Fluorine (F)
Rubidium (Rb)
Krypton (Kr)
Sulfur (S)
Antimony (Sb)
Germanium (Ge)
History of the Periodic Table
Notes
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
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
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
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
Dmitri Mendeleev (1871)
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
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
Periodic Table Worksheet
Use information from notes and
textbooks to complete. Upon
completion we will review it as a class.
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