Electrons%20Exam%20Corrections%20Periodicity%20Practice

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Electrons Exam CorrectionsPeriodicity Practice

• Periodic Trends Activity 3

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• 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

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Lesson Sequence

• Evaluate Warm Up
• Explain Electrons Exam Corrections
• Elaborate Periodicity Practice Worksheet
• Elaborate Applying the trends worksheet
• Evaluate Exit Ticket

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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?

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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

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Homework

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

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Agenda

• Warm-Up
• Electrons Exam Corrections
• Periodicity Practice
• Analyzing the trends Worksheet
• Exit Ticket

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Electrons Exam Corrections

• Complete the corrections at your desk. Ms. Ose
  will explain the requirements for the re-quiz
  next class

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Why do the Trends Occur?
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Atomic Radius

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

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Atomic Radius
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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
• Why?
• The electrons are farther away from the nucleus.
  They are less attracted to the atom making them
  easier to remove

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Electronegativity

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

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Electronegativity
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Periodicity Practice Worksheet

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

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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

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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