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Launch: 10/12       1. What is the main
                        difference?
Unit #2 Exam Data:
                     2. What is the biggest
                        reason for the
                        difference?


Quiz #4 Data:         Our Goal: 80%
                      Our Score: 79.29%
Launch: 10/12       1. What is the main
Unit #2 Exam Data:      difference?

                     2. What is the biggest
                        reason for the
                        difference?


Quiz #4 Data:        Our Goal: 80%
                     Our Score: 79.29%
Launch: 10/12       1. What is the main
                        difference?
Unit #2 Exam Data:
                     2. What is the biggest
                        reason for the
                        difference?


Quiz # 4 Data:        Our Goal: 80%
                      Our Score: 79.17%
Launch: 10/12       1. What is the main
                        difference?
Unit #2 Exam Data:
                     2. What is the biggest
                        reason for the
                        difference?


Quiz # 4 Data:        Our Goal: 80%
                      Our Score: 79.00%
Mid-Term Exam Info
 Cumulative exam
   Unit #1: Atomic Structure
   Unit #2: The Periodic Table
   Unit #3: Nuclear Processes
 Opportunity to change your grade
 We dont have much time!
 If you dont understand something, ask!
   No copying
What is the trend in
  atomic radius?
       Mr. Heffner
       10/12/09
Review: Period vs. Group
 Period = row (left to right)




 Group = column (top to bottom)
Atomic Radius
 Atomic radius is
     the size of an atom.



                                  0
                              0       0
                              0




     big radius = big atom
Atomic Radius
 The trend:
    1. Atomic radius decreases across a period (LR)
    2. Atomic radius increases down a group (Top  Bottom)
                         Decreases
      Increases
Example
        Which has a smaller atomic radius,
           fluorine (F) or nitrogen (N)?
 Step #1: Find the elements
Example
        Which has a smaller atomic radius,
           fluorine (F) or nitrogen (N)?
 Step #2: Look at the keyword
       Which has a smaller atomic radius,
           fluorine (F) or nitrogen (N)?
Example
         Which has a smaller atomic radius,
            fluorine (F) or nitrogen (N)?
 Step #3: Identify which is closest to He
Example
         Which has a larger atomic radius,
          sodium (Na) or potassium (K)?
 Step #1: Find the elements
Example
         Which has a larger atomic radius,
          sodium (Na) or potassium (K)?
 Step #2: Look at the keyword
       Which has a larger atomic radius,
        sodium (Na) or potassium (K)?
Example
          Which has a larger atomic radius,
           sodium (Na) or potassium (K)?
 Step #3: Identify which is closest to Fr
Practice Questions
 Review Worksheet #1
   Use the 3-step method!
Atomic Radius
 The trend:
    1. Atomic radius decreases across a period (LR)
    2. Atomic radius increases down a group (Top  Bottom)
                         Decreases
      Increases
Homework
 Review your notes
 Finish Review Worksheet #1
 Make a problem from scratch like question 6 or 7
  on the worksheet. Solve it!

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10/12 Review: What is atomic radius?

  • 1. Launch: 10/12 1. What is the main difference? Unit #2 Exam Data: 2. What is the biggest reason for the difference? Quiz #4 Data: Our Goal: 80% Our Score: 79.29%
  • 2. Launch: 10/12 1. What is the main Unit #2 Exam Data: difference? 2. What is the biggest reason for the difference? Quiz #4 Data: Our Goal: 80% Our Score: 79.29%
  • 3. Launch: 10/12 1. What is the main difference? Unit #2 Exam Data: 2. What is the biggest reason for the difference? Quiz # 4 Data: Our Goal: 80% Our Score: 79.17%
  • 4. Launch: 10/12 1. What is the main difference? Unit #2 Exam Data: 2. What is the biggest reason for the difference? Quiz # 4 Data: Our Goal: 80% Our Score: 79.00%
  • 5. Mid-Term Exam Info Cumulative exam Unit #1: Atomic Structure Unit #2: The Periodic Table Unit #3: Nuclear Processes Opportunity to change your grade We dont have much time! If you dont understand something, ask! No copying
  • 6. What is the trend in atomic radius? Mr. Heffner 10/12/09
  • 7. Review: Period vs. Group Period = row (left to right) Group = column (top to bottom)
  • 8. Atomic Radius Atomic radius is the size of an atom. 0 0 0 0 big radius = big atom
  • 9. Atomic Radius The trend: 1. Atomic radius decreases across a period (LR) 2. Atomic radius increases down a group (Top Bottom) Decreases Increases
  • 10. Example Which has a smaller atomic radius, fluorine (F) or nitrogen (N)? Step #1: Find the elements
  • 11. Example Which has a smaller atomic radius, fluorine (F) or nitrogen (N)? Step #2: Look at the keyword Which has a smaller atomic radius, fluorine (F) or nitrogen (N)?
  • 12. Example Which has a smaller atomic radius, fluorine (F) or nitrogen (N)? Step #3: Identify which is closest to He
  • 13. Example Which has a larger atomic radius, sodium (Na) or potassium (K)? Step #1: Find the elements
  • 14. Example Which has a larger atomic radius, sodium (Na) or potassium (K)? Step #2: Look at the keyword Which has a larger atomic radius, sodium (Na) or potassium (K)?
  • 15. Example Which has a larger atomic radius, sodium (Na) or potassium (K)? Step #3: Identify which is closest to Fr
  • 16. Practice Questions Review Worksheet #1 Use the 3-step method!
  • 17. Atomic Radius The trend: 1. Atomic radius decreases across a period (LR) 2. Atomic radius increases down a group (Top Bottom) Decreases Increases
  • 18. Homework Review your notes Finish Review Worksheet #1 Make a problem from scratch like question 6 or 7 on the worksheet. Solve it!