CH+08+Periodic+Trends

=__**Periodic Trends Assignment Part 1:**__= __**Read**__ Chapter 8 regarding periodic trends.

Create a "Prezi" for one of the periodic trends **(atomic radii, electronegativity, electron affinity, ionic radii, ionization energy)**. Your group will be assigned a periodic trend. The Prezi should be designed to be more of a tutorial for those that will be viewing it since you will not actually use it as a presentation.

=__**Objectives:**__= The "Prezi" must address the following for your assigned trend;
 * Thoroughly describe what the property is. In other words, if you are assigned "atomic radii", then you must thoroughly describe what atomic radii is and what it means.
 * State the trend. For example, if you are assigned "ionic radii", state how the size of a cation compares to its parent atom.
 * Explain the trend. For example if you have stated that atoms tend to get bigger going down a group, now you must explain why they get bigger. In your explanation you must use knowledge of atomic structure and the fundamental forces invloved.
 * Include at least 4 examples in question and answer format similar to a homework or quiz question/problem.
 * Include pics/graphics in your Prezi to add interest.
 * Your Prezi is worth 25 pts.**

You will be provided 1 class period in the computer lab to become accustomed to the program and ask me questions as needed. During this computer lab session you will be given time to view the tutorials available on the [|Prezi] site, view other Prezis, and begin to make you own Prezi. I will also show you how to invite editors so that everyone in your group can work on the same Prezi from different computers.

Below is an example of a partially completed Prezi. To view it, click on the play arrow toward the bottom center of the screen. Continue to click the arrow to advance thru the prezi. media type="custom" key="10190061"

=__Periodic Trends Assignment Part 2:__= Once the Prezis are complete, I will post links to them for you to view each one. You will then respond on the discussion board regarding each Prezi. Grading will be according to the. Each discussion thread(each Prezi discussion) **is worth 5 pts.**

=__Periodic Trends Assignment Part 3:__= Respond to each of the following questions (Question 1, Question 2, and Question 3) in the discussion area.

Continue to draw on what you are reading in the textbook and online resources as well as each others’ posts. The thread should be a continuous exchange of ideas (questioning is an essential part of this exchange) with supporting data and information.
 * __**QUESTION 1:**__ Gallium has a larger atomic radii than Zinc, which is a deviation to the trend. Attempt to explain this by referencing the electron configurations and orbital diagrams(the atomic structure) for these elements. **5 pts** according to the discussion board rubric.


 * __**QUESTION 2:**__ Sulfur has a smaller first ionization energy than phosphorus, which is a deviation from the trend. Make an attempt to explain why by referencing the electron configurations and orbital diagrams for those elements. **5 pts** according to the discussion board rubric.


 * __**QUESTION 3:**__ Choose one sentence from the following excerpt and rewrite it in such a way that it will offer greater contextual clarity. If a particular sentence has already been chosen by numerous students......then choose a different one. You may also choose a sentence or phrase and expand on it to add clarity. “Adversely, anions gain electrons resulting in a more negative force. The repulsion between the protons and greater number of electrons cause an expansion in the anion. So, anions have larger radii than their corresponding atoms. The effective nuclear charge also takes effect because it changes the strength of the positive or negative charge. This concept relies on charges and the attractions or repulsions between them.” **5 pts** according to the discussion board rubric.