Launch: 10/12 1.  What is the main difference?

2.  What is the biggest reason for the difference?

Unit #2 Exam Data:

Quiz #4 Data: Our Goal: 80% Our Score: 79.29%

Launch: 10/12 Unit #2 Exam Data:

Quiz #4 Data:

1.  What is the main difference?

2.  What is the biggest reason for the difference?

Our Goal: 80% Our Score: 79.29%

Launch: 10/12 Unit #2 Exam Data:

Quiz # 4 Data:

1.  What is the main difference?

2.  What is the biggest reason for the difference?

Our Goal: 80% Our Score: 79.17%

Launch: 10/12 Unit #2 Exam Data:

Quiz # 4 Data:

1.  What is the main difference?

2.  What is the biggest reason for the difference?

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 don’t have much time!

  If you don’t 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.

  big radius = big atom

0

0

00

Atomic Radius   The trend:

1.  Atomic radius decreases across a period (LR)

2.  Atomic radius increases down a group (Top Bottom)

Incr

ease

s

Decreases

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)

Incr

ease

s

Decreases

Homework   Review your notes

  Finish Review Worksheet #1

  Make a problem from scratch like question 6 or 7 on the worksheet. Solve it!